881862T1 Fuel Pump Assembly for Mercury Mariner 25HP 30HP 40HP 45HP 50HP 55HP 60HP | JLM Marine

Fuel Pump Assembly – Fits Mercury Mariner 4-Stroke 25HP 30HP 40HP 45HP 50HP 55HP 60HP Outboard Engines

This fuel pump assembly is engineered to fit Mercury Mariner 4-Stroke outboard engines ranging from 25HP to 60HP, providing reliable fuel delivery for consistent engine performance. Designed for 3-cylinder configurations, this assembly ensures proper fuel flow for your marine outboard motor.

Direct replacement for OEM part numbers 881862T1, 881862T07, 892874T, 899106T, and 8M0141844, offering a cost-effective aftermarket solution without sacrificing quality or reliability.

• Includes fuel pump assembly, 3 cable ties for secure installation
• Compatible with Mercury Mariner 4-Stroke 25HP, 30HP, and 40HP 3-cylinder outboard engines
• Note: This pump features two hose connectors on one side—verify configuration against your original part

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. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 × Fuel Pump Assembly
• 3 × Cable Ties (for secure hose connections)

Important: Verify the hose connector configuration—this pump has two hose connectors on one side. Compare with your original part before installation.

Installation Guide

1. Safety First: Disconnect the battery and ensure the fuel system is depressurized before beginning work.
2. Access the Fuel Pump: Locate the existing fuel pump assembly on your outboard engine. You may need to remove cowling or access panels.
3. Disconnect Fuel Lines: Carefully disconnect the fuel inlet and outlet hoses from the old pump, noting their positions and orientation.
4. Remove Electrical Connections: Unplug any electrical connectors attached to the fuel pump.
5. Unbolt the Old Pump: Remove the mounting bolts securing the fuel pump to the engine block and carefully extract the old assembly.
6. Inspect Mounting Surface: Clean the mounting area and inspect for debris, corrosion, or damage. Replace gaskets if needed.
7. Position the New Pump: Align the new fuel pump assembly with the mounting holes, ensuring the two-hose-connector side matches your configuration.
8. Secure with Bolts: Install and torque the mounting bolts to manufacturer specifications in a cross-pattern sequence.
9. Reconnect Fuel Lines: Attach the fuel inlet and outlet hoses to the correct ports on the new pump. Use the included cable ties to secure connections.
10. Reconnect Electrical: Plug in all electrical connectors, ensuring a firm and complete connection.
11. Test for Leaks: Reconnect the battery, prime the fuel system, and inspect all connections for fuel leaks before starting the engine.
12. Run Test: Start the engine and verify smooth operation, proper fuel delivery, and no abnormal sounds or leaks.

Troubleshooting & FAQ

Q: How do I confirm this fuel pump fits my Mercury engine?
A: Check your engine's serial number and horsepower rating against the compatibility table above. This pump fits Mercury Mariner 4-stroke engines from 25HP to 60HP, particularly 3-cylinder models. If unsure, provide your engine serial number to verify fitment before purchasing.

Q: What's the difference between this pump and the 21FP005 model?
A: While both may appear similar, the key difference is the hose connector configuration. This 881862T1 pump has two hose connectors on one side, whereas other models may have different layouts. Always compare the connector orientation and number with your original part to ensure proper fitment.

Q: How often should I replace my outboard fuel pump?
A: Fuel pump replacement intervals vary based on usage and fuel quality. Typical signs that replacement is needed include difficulty starting, engine sputtering or stalling, loss of power at high RPM, or visible fuel leaks. Most manufacturers recommend inspection every 100-200 hours of operation or annually.

Q: What are common signs that my fuel pump is failing?
A: Watch for these symptoms: engine struggling to start, inconsistent idling, sudden power loss during operation, engine misfiring or hesitation, whining or buzzing noises from the pump area, or fuel smell/visible leaks around the pump assembly. If you experience any of these, inspect or replace the fuel pump promptly.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.