Mechanical Fuel Pump – Fits Volvo Penta AQ Series (Replaces 841161, 18-7286)
Mechanical Fuel Pump – Fits Volvo Penta AQ Series (Replaces 841161, 18-7286) 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
Mechanical Fuel Pump – Fits Volvo Penta AQ Series (Replaces 841161,...
Product Details
This is an aftermarket Mechanical Fuel Pump for Volvo Penta AQ Series engines. It is designed to fit a wide range of gasoline inboard/sterndrive engines, specifically the 4-cylinder AQ120B through AQ171C series models manufactured from the early 1970s through the mid-1990s, ensuring reliable fuel delivery for classic marine power plants.
It serves as a direct replacement for Volvo Penta part number 841161 and interchanges with aftermarket references from Sierra (18-7286) and FridayParts (18-7286/841161-3/9-35425).
- Installation Method: Mechanical (Engine-Driven)
- Primary Fuel Type: Gasoline
- Essential Hardware: Includes a new mounting gasket for a leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 841161 |
| Volvo Penta | 77011 |
| Sierra | 18-7286 |
| FridayParts | 18-7286 |
| FridayParts | 841161-3 |
| FridayParts | 9-35425 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This fuel pump is compatible with the following Volvo Penta engine models.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Volvo Penta | AQ120B | 4-Stroke | 841161 |
| Volvo Penta | AQ125A, AQ125B | 4-Stroke | 841161 |
| Volvo Penta | AQ131A, AQ131B, AQ131C, AQ131D | 4-Stroke | 841161 |
| Volvo Penta | AQ140A | 4-Stroke | 841161 |
| Volvo Penta | AQ145A, AQ145B | 4-Stroke | 841161 |
| Volvo Penta | AQ151A, AQ151B, AQ151C | 4-Stroke | 841161 |
| Volvo Penta | AQ171A, AQ171C | 4-Stroke | 841161 |
| Volvo Penta | BB140A, BB145A | 4-Stroke | 841161 |
| Volvo Penta | 230A, 230B | 4-Stroke | 841161 |
| Volvo Penta | 250A, 250B, 251A | 4-Stroke | 841161 |
Technical Specs
- Product Type
- Mechanical Fuel Pump
- Installation
- Mechanical (Engine-Driven)
- Fuel Type
- Gasoline
- Housing Material
- Metal
- Housing Color
- Silver/Chrome
- Warranty
- 1 Year (FridayParts)
- Other Technical Attributes
- Includes mounting gasket
What’s in the Box
- 1 x Fuel Pump (841161)
- 1 x Mounting Gasket
Installation Notes
- Ensure the engine is cool. Disconnect the negative battery terminal for safety.
- Place a rag or container under the fuel pump to catch any spilled fuel.
- Carefully relieve any pressure from the fuel system.
- Disconnect the inlet and outlet fuel lines from the pump. Plug the lines to prevent leakage.
- Remove the mounting bolts holding the old fuel pump to the engine block.
- Remove the old fuel pump and gasket. Thoroughly clean the mounting surface of any old gasket material or sealant.
- Position the new mounting gasket on the engine block.
- Install the new fuel pump, ensuring the pump lever is correctly aligned with the engine's camshaft lobe or pushrod.
- Hand-tighten the mounting bolts, then torque them to the manufacturer's specified values.
- Reconnect the fuel lines to the new pump and tighten the fittings securely.
- Reconnect the battery terminal. Prime the fuel system if necessary, and start the engine. Check for any fuel leaks around the pump and fittings.
Troubleshooting & FAQ
How do I know if my mechanical fuel pump has failed?
Common signs of a failing mechanical fuel pump include engine sputtering at high speeds, loss of power, difficulty starting, or a noticeable fuel leak from the pump body. The engine may run fine at idle but struggle under load.
Is this a diaphragm-style pump?
Yes, this is a traditional mechanical diaphragm pump. It is operated by a lever that rides on a lobe of the engine's camshaft, creating pressure and vacuum to pull fuel from the tank and push it to the carburetor.
Can I install this myself?
While installation is straightforward for those with mechanical experience, it involves working with the fuel system. If you are not comfortable with the process, we strongly recommend professional installation to ensure safety and proper function.
What is the recommended replacement interval?
There is no fixed replacement interval for mechanical fuel pumps. They are typically replaced only when they fail or show signs of wear, such as leaking or low pressure. Regular inspection during engine service is recommended.
Will this pump work with ethanol-blended fuels?
This aftermarket pump is designed to be compatible with modern gasoline, including fuels containing up to 10% ethanol (E10). However, prolonged use of higher ethanol concentrations may accelerate wear on fuel system components.
Why is a gasket included?
The gasket provides a critical seal between the fuel pump and the engine block. Using the new, included gasket is essential to prevent oil from leaking out of the crankcase and fuel from leaking externally.
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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