Electric Fuel Pump – Fits Mercury MerCruiser 4.3L V6 Engines (Replaces 861155A6, 861155A5)
Electric Fuel Pump – Fits Mercury MerCruiser 4.3L V6 Engines (Replaces 861155A6, 861155A5) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This replacement Electric Fuel Pump is designed for Mercury MerCruiser 4.3L/LX V6 and 262 Magnum EFI engines produced between 1992 and 1997. It functions as a low-pressure auxiliary pump to ensure consistent fuel delivery and reliable engine performance.
It serves as a direct interchange for Mercury part numbers 861155A6, 861155A5, 805656A2, and Sierra 18-8867.
- Installs as a low-pressure, auxiliary fuel pump.
- Constructed with a durable stainless steel housing.
- Kit includes a wire harness with a multi-pin connector for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 861155A6 |
| Mercury | 861155A5 |
| Mercury | 805656A2 |
| Sierra | 18-8867 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
This pump is designed for the following Mercury MerCruiser models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.3L (GEN II) (2 BBL.) | 262 V6 | 4-Stroke | 1992–1993 | 861155A6 | Alpha One Engine |
| MerCruiser | 4.3LX (GEN II) (4 BBL.) | 262 V6 | 4-Stroke | 1992–1993 | 861155A6 | Alpha One Engine |
| MerCruiser | 4.3L (GEN II) (2 BBL.) | 262 V6 | 4-Stroke | 1993–1995 | 861155A6 | Alpha One Engine Gen II |
| MerCruiser | 4.3LX (GEN II) (4 BBL.) | 262 V6 | 4-Stroke | 1993–1995 | 861155A6 | Alpha One Engine Gen II |
| MerCruiser | 4.3LX (GEN +) (2 BBL.) | 262 V6 | 4-Stroke | 1996–1997 | 861155A6 | Alpha and Bravo (GEN +) |
| MerCruiser | 4.3LXH (GEN +) (4 BBL.) | 262 V6 | 4-Stroke | 1996–1997 | 861155A6 | Alpha and Bravo (GEN +) |
| MerCruiser | 4.3L (GEN II) (2 BBL.) | 262 V6 | 4-Stroke | 1996 | 861155A6 | Alpha/Bravo (GEN II) |
| MerCruiser | 4.3LX (GEN II) (4 BBL.) | 262 V6 | 4-Stroke | 1996 | 861155A6 | Alpha/Bravo (GEN II) |
| MerCruiser | 262 MAG (TBI)(GEN+) | - | 4-Stroke | - | 861155A6 | Fuel Pump And Fuel Filter(VST Fuel System) |
Technical Specs
- Product Type
- Electric Fuel Pump
- Installation
- Low pressure, auxiliary fuel pump
- Fuel Type
- Gasoline
- Connection
- Wire harness with multi-pin connector
- Housing Material
- Stainless Steel
- Housing Color
- Silver/Metal
- Product Dimensions
- 17.0" L x 13.0" W x 12.0" H
- Weight
- 0.78 kg (1.72 lbs)
- Fitting Type
- Barbed connections
- Working Pressure
- Low pressure (4-6 PSI typical)
What’s in the Box
- 1 x Fuel Pump (Replaces 861155A6/861155A5)
- 1 x Mounting Bracket
- 1 x Wire Harness with Multi-pin Connector
- 1 x Connection Accessories
Installation Notes
- Safety First: Disconnect the boat's battery and work in a well-ventilated area away from any sparks or open flames.
- Relieve Fuel Pressure: Safely relieve the pressure from the fuel system according to your engine's service manual.
- Disconnect: Carefully disconnect the fuel lines and the electrical wire harness from the old fuel pump. Use a container to catch any residual fuel.
- Remove Old Pump: Unbolt and remove the old fuel pump and its mounting bracket.
- Install New Pump: Mount the new fuel pump using the provided bracket and hardware. Ensure it is oriented correctly.
- Reconnect: Securely attach the fuel lines and connect the new wire harness. Ensure fittings are tight to prevent leaks.
- Check for Leaks: Reconnect the battery, prime the fuel system, and start the engine. Carefully inspect all connections for any signs of fuel leaks before operating the vessel.
Troubleshooting & FAQ
How do I confirm this pump fits my engine?
The best way to confirm fitment is to check your original part number against the ones listed in our Part Number Matrix. You can also review the Engine & Model Compatibility table to see if your specific engine model and year are included.
What are the signs of a failing fuel pump?
Common symptoms include difficulty starting the engine, engine sputtering at high speeds, loss of power, or a whining noise coming from the fuel tank area. Inconsistent fuel pressure is a primary indicator.
Is this a high-pressure or low-pressure pump?
This is a low-pressure auxiliary fuel pump, typically operating between 4-6 PSI. It is designed to work with carbureted and TBI systems, not high-pressure EFI systems that require an in-tank or frame-mounted high-pressure pump.
What is the recommended replacement interval?
There is no fixed replacement interval for fuel pumps. They are typically replaced when they fail or show signs of wear. For preventative maintenance, some boat owners replace them every 5-7 years, especially in saltwater environments.
What should I do if the new pump doesn't work after installation?
First, double-check all electrical connections to ensure the wire harness is securely plugged in and the pump is properly grounded. Verify that the battery is connected and the ignition system is providing power. If issues persist, contact our support team.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out 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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