Sierra 18-7275 Fuel Pump, Replaces 2278747 3640670, Fits MerCruiser 325-GM and 330 GM

The Sierra 18-7275 is a mechanical fuel pump built for MerCruiser 325-GM and 330 GM stern drive and inboard engines. It draws fuel from the tank and delivers it to the carburetor at the pressure and volume the engine's GM-based fuel system requires, and it is constructed of aluminum for corrosion resistance in the marine engine compartment. The pump includes a mounting gasket, so it is ready to bolt onto the engine block without sourcing a separate gasket. Its inlet connection measures 0.95 inches and its outlet connection measures 0.5 inches, both using barb-style fittings for a secure hose connection, and the mounting flange is identified as flange ID 41422. Overall dimensions are compact at 0.39 x 0.39 x 0.39 inches for the pump body, and the unit weighs 3.21 pounds. The 18-7275 is a direct cross-reference for OEM numbers 2278747 and 3640670, and it is built to meet or exceed the fit, form, and function of the original equipment fuel pump it replaces. Owners of MerCruiser 325-GM engines and 330 GM engines from serial number 4623115 and up can use this part number to replace a worn, leaking, or underperforming factory fuel pump without modifying the engine's fuel delivery components.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7275
• Weight: 3.21 pounds
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Material: Aluminum
• Mounting Type: Tank Mount
• Inlet Connection Size: 0.95 inches
• Outlet Connection Size: 0.5 inches
• Connector Type: Barb
• Flange ID: 41422
• Included Components: Fuel pump with mounting gasket
• UPC: 030999322463

Fitment

• MerCruiser 325-GM
• MerCruiser 330 GM, serial number 4623115 and up

Replaces (OEM)

• 2278747
• 3640670

Frequently Asked Questions

What engines does the Sierra 18-7275 fuel pump fit? The 18-7275 fits MerCruiser 325-GM engines and MerCruiser 330 GM engines from serial number 4623115 and up.

What OEM part numbers does the 18-7275 replace? This pump directly replaces OEM numbers 2278747 and 3640670 used on MerCruiser 325-GM engines.

Is the 18-7275 an electric or mechanical fuel pump? The Sierra 18-7275 is a mechanical fuel pump, driven by the engine rather than by an electric motor.

What material is the 18-7275 fuel pump made of? It is made of aluminum, chosen for its corrosion resistance in a marine engine compartment.

Does the 18-7275 come with a mounting gasket? Yes, the Sierra 18-7275 fuel pump includes a mounting gasket for installation.

What size are the inlet and outlet fittings on the 18-7275? The inlet connection is 0.95 inches and the outlet connection is 0.5 inches, both barb-style fittings.

How much does the Sierra 18-7275 fuel pump weigh? The 18-7275 weighs 3.21 pounds.

How does the Sierra 18-7275 compare to the original MerCruiser fuel pump? The 18-7275 is built to meet or exceed the fit, form, and function of the original equipment fuel pump it replaces, using OEM cross-reference numbers 2278747 and 3640670.

What are the physical dimensions of the 18-7275 fuel pump body? The pump body measures 0.39 x 0.39 x 0.39 inches.

What is the flange identification for the 18-7275? The 18-7275 uses flange ID 41422 for mounting to the engine.

Will the 18-7275 work on a 330 GM engine with an early serial number? The 18-7275 is specified for 330 GM engines from serial number 4623115 and up; earlier serial numbers are not covered by this fitment.

Is the 18-7275 a genuine Sierra part or aftermarket? The 18-7275 is a Sierra-branded fuel pump manufactured to meet or exceed the original equipment part it replaces.