{"title":"Mercury 4-Stroke 4-9.8HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis page is for Mercury 4-Stroke 4–9.8HP outboard engines. Use it to quickly find compatible parts and essential service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection for a wider selection. Scroll to the bottom of the page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0a5;border-radius:6px;color:#fff;text-decoration:none;\"\u003eBrowse All Mercury Parts\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 4–9.8HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the serial\/ID plate on the transom mounting bracket or swivel bracket; it lists the serial number and basic model info used to confirm parts.\u003c\/li\u003e\n    \u003cli\u003eNote configuration details: shaft length (S\/L\/XL), tiller vs. remote controls, and manual vs. electric start—these options can change ignition, harness, and bracket parts.\u003c\/li\u003e\n    \u003cli\u003eFor 4‑Stroke small motors: 4\/5\/6HP are typically single‑cylinder; 8\/9.8HP are typically twin‑cylinder. Some service parts interchange within each family, but jets, ignition modules, and gaskets can vary by serial range.\u003c\/li\u003e\n    \u003cli\u003eRecord your serial number before ordering; it’s the most reliable way to confirm the correct impeller kit, carburetor components, and ignition parts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003e4–6HP Portable FourStroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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; manual start common with optional charging coil.\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;\"\u003eMercury FourStroke 4HP, 5HP, 6HP variants (short\/long shaft, tiller).\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, portable, simple upkeep, very low fuel consumption.\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;\"\u003eMany cooling and anode parts interchange across this family; carburetor jets, gaskets, and ignition components often depend on serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e8–9.8HP Portable FourStroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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; manual or electric start; tiller or remote 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;\"\u003eMercury FourStroke 8HP and 9.8HP (various shaft lengths and control types).\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 low‑end torque for loaded dinghies and fishing skiffs; smooth operation.\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;\"\u003eImpellers, anodes, and many seals overlap within this platform; verify ignition, carb, and control parts by serial number.\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:12px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for small 4‑stroke outboards. Always follow the official Mercury service manual for your exact serial number and usage conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:1000px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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 + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eFirst 20 hours, then every 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse NMMA FC‑W oil; change with warm engine for complete drain.\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;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect for water intrusion and metal debris; replace drain screw gaskets.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury 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;\"\u003eInspect every 100 hours; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCheck gap and look for fouling from rich mixture or extended idling.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eFuel filter \/ inline filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eReplace sooner if running ethanol fuel or after storage; keep a spare onboard.\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;\"\u003eEvery 2 seasons (or 100–200 hours)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCritical for cooling; sandy or silty water may require annual replacement.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAnodes (zinc\/aluminum\/magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect often; replace at ~50% loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eChoose material for your water type (salt\/brackish\/fresh) to prevent corrosion.\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    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003cp style=\"font-size:12px;color:#666;\"\u003e*Intervals assume normal recreational use. Shorten intervals for heavy duty, commercial, or harsh operating environments.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:12px 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\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair 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: \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion: \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase Seals \u0026amp; Gaskets: \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:1000px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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 tell‑tale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect intake screens for blockage; verify tell‑tale hose is clear; confirm impeller age.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump kit, intake screen, thermostat, tell‑tale hose.\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;\"\u003eCheck fresh fuel, primer bulb firmness, and choke\/enrichment operation; inspect spark plug condition and gap.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInline fuel filter, fuel line\/primer bulb, spark plugs, carb gaskets\/jet kit.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfirm prop is correct pitch and undamaged; check for fouled plugs or partially clogged jets.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePropeller, spark plugs, carburetor service kit, fuel filter.\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;\"\u003eVerify proper oil level; look for water intrusion (milky oil); inspect prop shaft for fishing line damaging seals.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eDrain\/fill gaskets, lower unit seal kit, bearings, gear oil.\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:12px 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\u003eSome items (impellers, anodes, basic seals) often interchange within the 4–6HP family and within the 8–9.8HP family. Carburetor, ignition, and control parts can change with serial number and options. Always confirm by serial number before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eInspect annually and replace every two seasons (or sooner if you run sandy\/silty water or notice a weak tell‑tale). An impeller that fails can quickly overheat and damage the engine.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eReplace gear oil every 100 hours or annually. Check for milky oil (water contamination) and for metal shavings after impacts or prop strikes.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the engine’s serial number, horsepower, stroke type (4‑Stroke), shaft length, and whether it is manual or electric start. Photos of the nameplate and the part you’re replacing 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 parts by horsepower, year, and model? Browse our main Mercury collection and use the Filter \u0026amp; Sort tools to narrow results.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0a5;border-radius:6px;color:#fff;text-decoration:none;\"\u003eShop Mercury Outboard Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:12px;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\/mercury-4-stroke-4-9-8hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}