Fuel Pump Kit – Fits Mercury/Mariner 30-275 HP, Force 40-150 HP (Replaces 43990A10, 857005A1, 18-7817)

Product Details

This Fuel Pump Kit – Fits Mercury Mariner 30-275 HP and Force 40-150 HP Outboards (Replaces 43990A10, 857005A1, 18-7817) is designed to restore original performance and reliability to your marine engine's fuel system. It provides a comprehensive solution for rebuilding compatible fuel pump assemblies on a wide range of 2-stroke Mercury, Mariner, and Force outboards from 30 to 275 HP.

The kit serves as a direct interchange for multiple OEM and aftermarket part numbers, including Mercury 43990A10, 43990A11, 43990A7, 43990A9, Sierra 18-7817, and others, ensuring a precise fit and function. All components are manufactured to meet or exceed OEM specifications for durability and performance in marine environments.

• Engineered for direct-fit installation, replacing all necessary wear components of the original fuel pump assembly.
• Kit includes all required diaphragms, gaskets, check valves, and hardware for a complete rebuild.
• Specifically designed for use with gasoline in 2-stroke outboard applications.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit fits a wide range of Mercury and Mariner 2-stroke outboards from 30 HP to 275 HP. Please verify your specific model and OEM part number.

Also compatible with Force 2-stroke outboards from 40 HP to 150 HP that use a matching fuel pump assembly.

Technical Specs

Product Type

Fuel Pump Repair/Rebuild Kit

Fitment Type

Vehicle Specific Fit

Installation

Direct replacement for OEM assembly

Fuel Type

Gasoline

Connection

Hose Barb

Housing Material

Metal

Operation

Automatic

Mounting

Engine Mount

Dimensions

107 × 83 × 18 mm (4.21 × 3.27 × 0.71 inches) [package dimensions]

Weight

0.02 kg (0.634 oz)

Warranty

Amazon 30-Day Return Guarantee

What’s in the Box

• 1x Fuel Pump Rebuild Kit, including:
• Diaphragms
• Gaskets
• Check Valves
• Spring
• Cap
• Screws

Installation Notes

1. Disconnect the battery and relieve any pressure from the fuel system.
2. Carefully label and disconnect the fuel lines from the pump. Have rags ready to catch any spilled fuel.
3. Remove the mounting bolts securing the old fuel pump assembly to the engine block.
4. Carefully disassemble the old pump, noting the orientation of diaphragms, gaskets, and valves.
5. Clean all metal housing surfaces thoroughly, removing any old gasket material or debris.
6. Assemble the new kit components into the housing, ensuring each part is installed in the correct order and orientation as the original.
7. Reinstall the rebuilt fuel pump assembly onto the engine, tightening bolts to the manufacturer's specified torque.
8. Reconnect fuel lines and prime the system if required.
9. Reconnect the battery, start the engine, and carefully inspect for any fuel leaks around the pump and fittings.

Troubleshooting & FAQ

Safety & Important Info

• Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement part, 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 quality control.