Sierra 18-7800 Fuel Pump Kit - Replaces 438555, 433386 - Fits Johnson/Evinrude 20-30 HP Outboards 1990-2000

The Sierra 18-7800 Fuel Pump Kit is a complete fuel pump rebuild kit for Johnson/Evinrude outboard motors rated 20-30 HP for the 1990-2000 model years. It is designed as a direct equivalent to the original equipment fuel pump, replacing OEM numbers 438555 and 433386 so the pump can be rebuilt in place rather than replaced as a whole assembly.

The kit contains the parts needed to restore fuel pump function: two check valves (18-7796), two O-rings (18-7413 and 18-7403), and a fuel pump gasket (18-0850). These components seal and regulate fuel flow through the pump body, and replacing them addresses common fuel pump issues such as loss of prime, fuel leaks, and inconsistent fuel delivery caused by worn seals and check valves. Each component is precision-built to fit the pump housing it is designed for.

This kit is intended for outboard owners and marine technicians performing a fuel pump rebuild rather than a full pump replacement, and it is sized and packaged as a lightweight kit for straightforward installation during routine fuel system maintenance.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7800
• Product Type: Fuel Pump Kit
• Fitment: 20-30 HP Johnson/Evinrude outboard motors, 1990-2000
• OEM Cross Reference: 438555, 433386
• Weight: 0.03 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Kit Contents: (2) Check Valve 18-7796, (1) O-Ring 18-7413, (1) O-Ring 18-7403, (1) Fuel Pump Gasket 18-0850

Fitment

• 20-30 HP Johnson/Evinrude outboard motors, 1990-2000

Replaces (OEM)

• 438555
• 433386

Frequently Asked Questions

What outboard motors does the Sierra 18-7800 fuel pump kit fit? The 18-7800 kit fits Johnson/Evinrude outboard motors rated 20-30 HP for the 1990-2000 model years.

What OEM part numbers does the 18-7800 kit replace? It replaces OEM numbers 438555 and 433386, allowing the fuel pump to be rebuilt without sourcing the original manufacturer part.

Is this a full fuel pump or a rebuild kit? It is a rebuild kit for the existing fuel pump, not a complete replacement pump assembly.

What parts are included in the 18-7800 kit? The kit includes two check valves (18-7796), two O-rings (18-7413 and 18-7403), and a fuel pump gasket (18-0850).

How much does the 18-7800 fuel pump kit weigh? The kit weighs 0.03 pounds.

What are the dimensions of the fuel pump kit packaging? The kit measures 0.39 x 0.39 x 0.39 inches.

Will this kit work on a different horsepower outboard? The 18-7800 kit is designated for 20-30 HP Johnson/Evinrude motors from 1990-2000; other horsepower ranges use different Sierra fuel pump kits.

Is a fuel pump gasket included with the kit? Yes, one fuel pump gasket (18-0850) is included along with the check valves and O-rings.

What symptoms indicate this fuel pump kit is needed? Loss of engine prime, fuel leaks around the pump, or inconsistent fuel delivery typically indicate worn check valves, O-rings, or a gasket, which the 18-7800 kit addresses.

Does the 18-7800 kit include the pump housing itself? No, the kit contains the internal seal components (check valves, O-rings, and gasket) used to rebuild an existing fuel pump housing, not the housing itself.