{"title":"Tohatsu 4-Stroke 4-9.8HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis guide is tailored for Tohatsu 4‑Stroke 4–9.8HP outboard engines. It helps you identify compatible parts, understand routine service needs, and solve common issues. Below you’ll find maintenance tips, frequently replaced parts, and troubleshooting guidance. You can also browse the main Tohatsu collection anytime. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #0b5;padding:10px 14px;border-radius:6px;text-decoration:none;\"\u003eBrowse All Tohatsu Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 4–9.8HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate location: Check the identification\/serial plate on the transom clamp bracket (typically starboard side). The same code is often on a sticker under the engine cowling.\u003c\/li\u003e\n    \u003cli\u003eReading the model code: Tohatsu 4‑stroke models use codes such as MFS4\/5\/6 and MFS8\/9.8. Suffix letters\/numbers indicate features like shaft length (S=15”, L=20”, UL=25”), manual\/electric start, and revision level.\u003c\/li\u003e\n    \u003cli\u003e4‑stroke identifiers: Look for an oil fill cap, dipstick, and valve cover. Most engines in this range are carbureted; some variants may have front‑mounted shift controls or optional electric start kits.\u003c\/li\u003e\n    \u003cli\u003ePlatform hints: 4\/5\/6HP are typically single‑cylinder; 8\/9.8HP are twin‑cylinder. Many service parts (water pump components, anodes, some gaskets) are shared within each platform family.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003eMFS4\/5\/6 Platform (4–6HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:900px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSingle‑cylinder, carbureted 4‑stroke with manual or optional electric start, S\/L shaft options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eMFS4, MFS5, MFS6 variants (S\/L).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eLightweight and portable, quiet operation, excellent fuel economy.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eRoutine maintenance focuses on oil changes, spark plugs, fuel filtration, and the water pump impeller. Many wear items are common across these models.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eMFS8\/9.8 Platform (8–9.8HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:900px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eTwin‑cylinder, carbureted 4‑stroke with S\/L\/UL shafts available on some variants; manual or electric start options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eMFS8, MFS9.8 (e.g., later revisions such as “A” series). Front‑shift kits and electric‑start packages exist on select models.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eStronger mid‑range torque than 4–6HP class, smooth idle, good fuel efficiency, versatile shaft length options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump, thermostat, gaskets, and many service items are shared within the 8\/9.8 family. Verify shaft length and starting system when selecting parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical recreational use. Always follow the official Tohatsu service manual for your exact model and operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:1000px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEngine oil (and filter where applicable)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse FC‑W 4‑stroke marine oil; change more often for heavy use or trolling.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect for water intrusion and metal shavings; replace gaskets when servicing.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCheck gap and insulator color; replace if fouled or worn.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plug\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eFuel filter (inline\/under‑cowl)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect 50 hours; replace annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse fresh fuel; drain\/replace if contamination is found.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e2 seasons or 200 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eReplace sooner if weak telltale or overheat alarm occurs.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAnodes (internal \u0026amp; external)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect every 50 hours; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCorrosion protection; use appropriate alloy for your water (zinc\/aluminum\/magnesium).\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eThermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e2–3 seasons or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSticking thermostat can cause overheat or cold‑running.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\"\u003eTohatsu Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eValve clearance (4‑stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEvery 200 hours (check)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAdjust as needed for smooth idle and easy starting.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\"\u003eTohatsu Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service: \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals: \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System: \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection \u0026amp; Propulsion: \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:1000px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWeak telltale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect intake screens for blockage; verify impeller condition and thermostat operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump repair kit, thermostat, intake screen\/grommets.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfirm fresh fuel, correct choke\/prime, clean spark plugs, and unobstructed fuel filter.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSpark plugs, inline fuel filter, carburetor repair components.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCheck propeller for damage\/slip, fuel delivery, and compression; verify throttle opens fully.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePropeller, fuel pump, fuel filter, spark plugs.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eChange gear oil and inspect; look for water intrusion at seals and prop shaft fishing line damage.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eLower unit seal kit, drain\/fill plug gaskets, prop shaft seals.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eElectric start inoperative (where equipped)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eVerify battery charge and cables, fuse, neutral‑safety switch, and starter solenoid.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eStarter motor, solenoid, rectifier\/regulator, battery cables.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eMany wear items (water pump components, anodes, some gaskets and seals) are shared within each platform family (MFS4\/5\/6 and MFS8\/9.8). However, verify by full model code, shaft length, and serial range before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventive measure, replace the impeller every 2 seasons or ~200 hours. Replace sooner if you see a weak telltale, overheat warnings, or if the motor has sat unused for a long period.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change lower unit gear oil?\u003c\/summary\u003e\n    \u003cp\u003eChange gear oil every 100 hours or annually, and anytime you suspect water intrusion. Replace drain\/fill plug gaskets and inspect magnetic plugs for metal debris.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the full model code (e.g., MFS9.8 with suffix), serial number, shaft length (S\/L\/UL), and whether the engine is manual or electric start. Photos of the nameplate and the existing part are very helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eReady to find the correct parts by horsepower, year, and model? Browse our main Tohatsu catalog and use the filters to narrow down to your engine.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #0b5;border-radius:6px;text-decoration:none;\"\u003eShop Tohatsu Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#555;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"fuel-pump-fits-tohatsu-nissan-mercury-4-9-8hp-4-stroke-replaces-3h6-04000-7-803529t06","title":"Fuel Pump for Tohatsu, Nissan \u0026 Mercury 4–9.8 HP 4-Stroke Outboards – Replaces 3H6-04000-7 and 803529T06","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003efuel pump\u003c\/strong\u003e is intended as a replacement for selected Tohatsu, Nissan, Mercury, and Mariner 4-stroke outboard engines rated from 4 HP to 9.8 HP. It is designed to support reliable fuel delivery for normal engine operation.\u003c\/p\u003e\n\u003cp\u003eThe listed replacement references include Tohatsu numbers \u003cstrong\u003e3H6-04000-7\u003c\/strong\u003e, \u003cstrong\u003e3H6-04000-3\u003c\/strong\u003e, and \u003cstrong\u003e3H6-04000-4\u003c\/strong\u003e, along with Mercury references \u003cstrong\u003e803529T06\u003c\/strong\u003e and \u003cstrong\u003e803529T01 through 803529T05\u003c\/strong\u003e. Confirm the number on your original pump and compare the pump configuration before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAftermarket replacement fuel pump for selected small 4-stroke outboards.\u003c\/li\u003e\n  \u003cli\u003eMetal housing suitable for typical marine service conditions.\u003c\/li\u003e\n  \u003cli\u003ePackage includes an O-ring and hose clamp as listed below.\u003c\/li\u003e\n  \u003cli\u003eFitment depends on the exact engine model, year, serial range, and original part number.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse these references as an interchange guide only. Always verify the complete engine identification and compare the original component before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-7\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-4\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T01\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T02\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T04\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e803529T05\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis replacement is listed for selected Tohatsu, Nissan, Mercury, and Mariner 4-stroke outboards in the 4 HP to 9.8 HP range. The broad horsepower range alone does not confirm fitment; exact model, year, serial range, stroke, and original pump number must be checked together.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eApplication Scope\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYear \/ Serial Condition\u003c\/th\u003e\n        \u003cth\u003eReference Numbers\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eTohatsu\u003c\/td\u003e\n        \u003ctd\u003eSelected small outboard models\u003c\/td\u003e\n        \u003ctd\u003e4–9.8 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eConfirm exact model, year, and serial range\u003c\/td\u003e\n        \u003ctd\u003e3H6-04000-7, 3H6-04000-3, 3H6-04000-4\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNissan\u003c\/td\u003e\n        \u003ctd\u003eSelected small outboard models\u003c\/td\u003e\n        \u003ctd\u003e4–6 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eConfirm exact model, year, and serial range\u003c\/td\u003e\n        \u003ctd\u003eCompare with original pump and reference number\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003eSelected small outboard models\u003c\/td\u003e\n        \u003ctd\u003e4–9.8 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eConfirm exact model, year, and serial range\u003c\/td\u003e\n        \u003ctd\u003e803529T06 and 803529T01–803529T05\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eAftermarket fuel pump\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected gasoline 4-stroke outboard engines\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eReplacement installation; verify fit before purchase\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n  \u003cdd\u003eMetal, listed as aluminum\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n  \u003cdd\u003eSilver\u003c\/dd\u003e\n  \u003cdt\u003eApproximate Package Dimensions\u003c\/dt\u003e\n  \u003cdd\u003e10 × 9 × 6 cm\u003c\/dd\u003e\n  \u003cdt\u003eApproximate Weight\u003c\/dt\u003e\n  \u003cdd\u003e176 g (0.39 lb)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Fuel pump\u003c\/li\u003e\n  \u003cli\u003e1 × Hose clamp, listed as 95395, approximately 9 × 1 mm\u003c\/li\u003e\n  \u003cli\u003e1 × O-ring, listed as 803513, approximately 2.4 × 20 mm inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm that the replacement pump matches the original pump and the engine's exact model and part-number requirements.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool, disconnect the battery negative terminal, and work in a well-ventilated area away from ignition sources.\u003c\/li\u003e\n  \u003cli\u003eTurn off the fuel supply and safely relieve fuel-system pressure where applicable.\u003c\/li\u003e\n  \u003cli\u003ePlace an absorbent cloth beneath the pump to collect spilled fuel.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the fuel inlet and outlet lines, noting their original routing and orientation.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting fasteners and take off the old pump.\u003c\/li\u003e\n  \u003cli\u003eClean the mounting surface and inspect the fuel lines, fittings, and clamps for damage or deterioration.\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied O-ring and replacement pump. Tighten the mounting fasteners to the engine manufacturer's specification.\u003c\/li\u003e\n  \u003cli\u003eReconnect the fuel lines securely and install the supplied hose clamp where applicable.\u003c\/li\u003e\n  \u003cli\u003eRestore the fuel supply, reconnect the battery, and prime the fuel system according to the engine service procedure.\u003c\/li\u003e\n  \u003cli\u003eBefore operating the engine, inspect the pump and all connections for fuel leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm whether this fuel pump fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eCheck the complete engine brand, model, year, serial range, horsepower, and stroke configuration. Compare the original pump's part number, mounting arrangement, fuel-line connections, and physical configuration with the references listed on this page. A horsepower match by itself is not sufficient.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing fuel pump?\u003c\/summary\u003e\n  \u003cp\u003ePossible symptoms include hard starting, sputtering, hesitation, loss of power, engine stalling, or fuel leakage around the pump or its connections. These symptoms can also result from blocked filters, damaged fuel lines, carburetor problems, or other fuel-system faults.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs there a fixed replacement interval?\u003c\/summary\u003e\n  \u003cp\u003eFuel pumps generally do not have one universal replacement interval. Inspect the pump during routine service and replace it when leakage, damage, deterioration, or fuel-delivery problems are found.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eAre special tools required?\u003c\/summary\u003e\n  \u003cp\u003eBasic hand tools are typically sufficient for removal and installation. A torque wrench is recommended when tightening mounting fasteners to the engine manufacturer's specification.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for an aftermarket replacement fuel pump. The references shown are manufacturer or interchange numbers used to help identify the intended application; they do not mean this product is manufactured by Tohatsu, Nissan, Mercury, or Mariner.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow quickly will the order ship?\u003c\/summary\u003e\n  \u003cp\u003eAvailable shipping methods, delivery estimates, and shipping charges are shown at checkout and may vary by destination and service level.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eWarranty coverage and return eligibility are governed by the applicable order and store policies. Contact support with your order details before returning or installing a part if you believe it is incorrect or defective.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWork only on a cool engine in a well-ventilated area and keep fuel away from flames, sparks, and other ignition sources.\u003c\/li\u003e\n  \u003cli\u003eVerify the exact engine model, year, serial range, stroke, and original part number before ordering.\u003c\/li\u003e\n  \u003cli\u003eCompare the product's dimensions, connections, mounting points, and appearance with the original component.\u003c\/li\u003e\n  \u003cli\u003eDo not operate the engine if fuel leaks are present.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the correct fuel-system procedure or torque specifications are unavailable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Practical replacement components for common marine repair applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment-Focused Listings\u003c\/strong\u003e — Product references and application guidance are provided to help with pre-purchase comparison.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — Contact support if you need help comparing the replacement with your original component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723978281275,"sku":"JLM17FP001","price":28.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Fuel_Pump_for_Tohatsu_Nissan_MFS_NSF_4-98_HP___3H6-04000-0_-_JLM_MARINE-8288361.jpg?v=1763039109"}],"url":"https:\/\/seasierra.com\/collections\/tohatsu-4-stroke-4-9-8hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}