Mercury Diaphragm Kit 23014A1 – Fits Mercury/Mariner 10-125 HP Engines
Mercury Diaphragm Kit 23014A1 – Fits Mercury/Mariner 10-125 HP Engines is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Mercury Diaphragm Kit 23014A1 – Fits Mercury/Mariner 10-125 HP Engines
Product Details
This aftermarket Mercury Diaphragm Kit 23014A1 is a direct replacement for fuel pumps on a wide range of Mercury and Mariner 2-stroke outboard engines, from 10 to 125 HP, primarily vintage models from the 1960s through the 1980s. It restores proper fuel delivery and engine performance.
It serves as a direct interchange for several aftermarket part numbers, including Sierra 18-7804, GLM 40310, and WSM 18-7840.
- Installation: Installs directly in place of the original OEM diaphragm without modification.
- Fuel Compatibility: Engineered for use with gasoline, including modern ethanol-blended fuels (e.g., E10).
- Durable Construction: Made from high-quality, fuel-resistant rubber/elastomer materials for longevity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 23014A1 | OEM |
| Sierra | 18-7804 | Aftermarket |
| GLM | 40310 | Aftermarket |
| WSM | 18-7840 | Aftermarket |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This diaphragm fits various classic Mercury and Mariner outboards. Please verify your specific model and check the serial number range where applicable to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 200 | 20 | 2-Stroke | 1973–1977 | 23014A1 | |
| Mercury | 350 | 35 | 2-Stroke | 23014A1 | ||
| Mercury | 500 | 50 | 2-Stroke | 1975 | 23014A1 | |
| Mercury | 650 (4 Cyl) | 65 | 2-Stroke | 1967 | 23014A1 | |
| Mercury | 800 | 80 | 2-Stroke | 23014A1 | ||
| Mercury | 950 | 95 | 2-Stroke | 23014A1 | ||
| Mercury | 1000/1000SS | 100 | 2-Stroke | 23014A1 | ||
| Mercury | 1000BP | 2-Stroke | 23014A1 | |||
| Mercury | 1100 | 110 | 2-Stroke | 23014A1 | ||
| Mercury | 1250 | 125 | 2-Stroke | 23014A1 | ||
| Mercury | 1250BP | 2-Stroke | 23014A1 | |||
| Mercury/Mariner | Various | 10–125 | 2-Stroke | 23014A1 | Fits serial range: 1335465–2670574 |
Technical Specs
- Product Type
- Fuel Pump Diaphragm Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline (including ethanol blends)
- Housing Material
- Fuel-resistant rubber/elastomer
- Product Dimensions
- 5.25 in x 4.0 in x 0.13 in
- Design Type
- Designed for mechanical fuel pumps
- Warranty
- Manufacturer standard warranty
What’s in the Box
- 1 x Fuel Pump Diaphragm (Replaces Mercury 23014A1)
Installation Notes
- Turn off the engine and allow it to cool completely. Disconnect the negative battery terminal for safety.
- Following your engine's service manual, safely relieve any pressure in the fuel system. Place absorbent rags under the fuel pump to catch any spills.
- Carefully note the position of the fuel lines, then disconnect them from the fuel pump assembly.
- Remove the mounting bolts that secure the fuel pump to the engine block.
- Disassemble the pump and carefully remove the old, worn diaphragm, paying attention to its orientation.
- Clean the pump housing surfaces and install the new diaphragm from the kit, ensuring it is properly seated.
- Reassemble the fuel pump and mount it back onto the engine, tightening bolts to the manufacturer's specified torque.
- Securely reconnect the fuel lines to their original positions.
- Reconnect the battery, prime the fuel system according to your engine's procedure, and meticulously check for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if my fuel pump diaphragm has failed?
Common signs of a failing diaphragm include the engine cranking but not starting, poor acceleration, sputtering at high speeds, or visible fuel leaks around the pump body. A fuel pressure test showing lower-than-specified pressure is a definitive indicator.
Will this kit fit an engine model that is not on your list?
This kit is specifically designed for the Mercury/Mariner models and year ranges listed. We do not recommend using it for other applications, as fitment and performance are not guaranteed. Always cross-reference your original OEM part number (23014A1) to ensure compatibility.
Is this diaphragm resistant to modern ethanol-blended gasoline?
Yes, this diaphragm is manufactured from modern, fuel-resistant elastomer materials that are fully compatible with today's gasoline, including fuels containing up to 10% ethanol (E10).
What is the recommended replacement interval for this part?
Fuel pump diaphragms do not have a strict replacement schedule. They are typically replaced only when they fail or as part of a comprehensive fuel system overhaul. It is good practice to inspect for signs of brittleness or cracking during other routine service.
Is this an OEM part or an aftermarket part?
This listing is for a high-quality aftermarket replacement, not an OEM component. It is engineered to meet or exceed OEM-level specifications using comparable materials and is manufactured in an ISO 9002 certified facility with batch inspections for quality control.
What are the shipping costs and delivery times?
We ship worldwide quickly—typical transit time is 5–15 days for most regions. Standard shipping is free on all orders. Expedited shipping options, if available for your location, will be presented at checkout.
What is your warranty and return policy?
This product is covered by a 1-year limited warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or contact us for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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