Mechanical Fuel Pump – Fits Volvo Penta AQ120-AQ251 Series (Replaces 841161, 18-7286)

Mechanical Fuel Pump – Fits Volvo Penta AQ120-AQ251 Series

This is an aftermarket mechanical fuel pump designed for a range of 4-cylinder Volvo Penta engines, including the AQ120B, AQ131, AQ145, and AQ151 series. It serves as a direct, engine-block-mounted replacement for several original and aftermarket part numbers.

It provides reliable fuel delivery from the tank to the carburetor and includes a provision for the vent tube, ensuring it meets the operational requirements of the specified engines.

• Installation Type: Engine Block Mounted
• Fuel Compatibility: Designed for use with Gasoline.
• Package Includes: 1x Fuel Pump, 1x Mounting Gasket

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Fuel Pump (Replaces OEM 841161)
• 1 x Mounting Gasket

Installation Guide

1. Disconnect the negative battery terminal to ensure safety.
2. Carefully relieve any pressure in the fuel system according to your service manual.
3. Place a rag or container beneath the fuel pump to catch any gasoline spillage.
4. Disconnect the fuel inlet and outlet lines from the pump. Plug the lines to prevent contamination.
5. Loosen and remove the mounting bolts securing the pump to the engine block.
6. Gently remove the old fuel pump and the gasket. Note the orientation of the pump arm.
7. Thoroughly clean the mounting surface on the engine block, removing any old gasket material.
8. Place the new gasket onto the engine block, followed by the new fuel pump.
9. Install and tighten the mounting bolts evenly to the manufacturer's recommended torque.
10. Reconnect the fuel inlet and outlet lines securely.
11. Reconnect the battery terminal, prime the fuel system, and start the engine.
12. Check carefully for any fuel leaks at the connections and mounting surface.

Troubleshooting & FAQ

How do I confirm this pump fits my Volvo Penta engine?
To ensure compatibility, compare your engine's model number (e.g., AQ125B, AQ151A) against our "Compatible Engine Models" list. You should also verify that your existing pump's part number matches one of the numbers in the "Part Number Cross-Reference" table, such as 841161 or 18-7286.

What are common signs my old fuel pump is failing?
Common symptoms include the engine sputtering at high speeds, a noticeable loss of power, difficulty starting, or engine hesitation during acceleration. A visible fuel leak from the pump body or its weep hole is also a clear indicator that replacement is needed.

Is the mounting gasket included with the pump?
Yes, a new mounting gasket is included in the package. Using the new gasket is critical to ensure a proper and leak-free seal against the engine block.

How often should a mechanical fuel pump be replaced?
There is no fixed replacement interval for this type of pump. It should be inspected during regular maintenance and replaced if you notice any signs of wear, leakage, or performance degradation. Many owners replace it as a preventative measure on older engines.

What's the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and what are the costs?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.