Sierra 18-7268 Fuel Pump for GM V-8 305, 307, 350, 400 Engines, Dual Diaphragm

The Sierra 18-7268 is a dual diaphragm fuel pump engineered for GM V-8 marine engines displacing 305, 307, 350, and 400 cubic inches. It mounts directly to the engine's flange (Flange I.D. #41415, M6948) and delivers fuel at 5.25 - 6.5 PSI, matching the pressure requirements of the original equipment pump it replaces. Because it is a dual diaphragm design, this pump requires a sight glass for proper operation and monitoring.

The pump body is constructed of aluminum for corrosion resistance in a marine environment, and the unit includes a mounting gasket for installation. It uses a hose barb inlet connection and a flange outlet connection, and mounts to the front of the engine using the flange mounting type. This part is built to meet or exceed the specifications of the original equipment pump it replaces, and cross-references to several common OEM part numbers used across GM-based marine engine applications, making it straightforward to identify as the correct replacement.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7268
• Fitment: GM (V-8) 305, 307, 350, 400
• Operating Pressure: 5.25 - 6.5 PSI
• Pump Type: Dual Diaphragm (Requires Sight Glass)
• Flange I.D. Number: 41415, M6948
• Material: Aluminum
• Body Material: Aluminum
• Mounting Type: Flange Mount
• Inlet Connection Type: Hose Barb
• Outlet Connection Type: Flange
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 3.27 pounds
• Included Components: Mounting gasket
• UPC: 030999322395

Fitment

• GM (V-8) 305, 307, 350, 400

Replaces (OEM)

• GLM 77102
• OMC 981650
• OMC 3853792
• Volvo Penta 3855276
• Mallory 9-35412

Frequently Asked Questions

What engines does the Sierra 18-7268 fuel pump fit? The Sierra 18-7268 fuel pump is designed for GM V-8 engines displacing 305, 307, 350, and 400 cubic inches.

What fuel pressure does this pump deliver? It delivers 5.25 to 6.5 PSI, matching the pressure range of the original GM V-8 fuel pump it replaces.

Is the 18-7268 a single or dual diaphragm pump? It is a dual diaphragm fuel pump, which requires a sight glass for proper operation and monitoring.

Does the 18-7268 include a mounting gasket? Yes, a mounting gasket is included with the Sierra 18-7268 fuel pump.

What is the flange I.D. Number for this pump? The Sierra 18-7268 uses Flange I.D. #41415 and M6948, which should be matched against the engine's original pump flange for confirmation of fit.

What OEM part numbers does the 18-7268 cross-reference to? The Sierra 18-7268 cross-references to GLM 77102, OMC 981650, OMC 3853792, Volvo Penta 3855276, and Mallory 9-35412.

What material is the Sierra 18-7268 fuel pump made from? The pump body is made of aluminum, chosen for corrosion resistance in marine applications.

How does the 18-7268 connect to the fuel line? The inlet connection is a hose barb type, and the outlet connection is a flange type.

How much does the Sierra 18-7268 fuel pump weigh? The Sierra 18-7268 fuel pump weighs 3.27 pounds.

How is the 18-7268 fuel pump mounted to the engine? It uses a flange mounting type and installs at the front of the engine.

Is the Sierra 18-7268 equivalent to the original GM fuel pump? Sierra states that the 18-7268 is built to meet or exceed the specifications of the original equipment fuel pump it replaces on GM V-8 305, 307, 350, and 400 engines.

What are the physical dimensions of the 18-7268 fuel pump? The Sierra 18-7268 fuel pump measures 0.39 x 0.39 x 0.39 inches.