Sierra 18-7330 Electric Fuel Pump - High Pressure MPI, Replaces 3857650, Fits 350/5.7L, 454/7.4L & 502/8.2L Engines

The Sierra 18-7330 is a high-pressure electric fuel pump built for 350/5.7L, 454/7.4L, and 502/8.2L engines equipped with multi-port fuel injection (MPI). It is engineered as a direct replacement for OEM part 3857650, restoring correct fuel delivery for MPI fuel systems that depend on consistent, high-pressure flow to the injectors.

This pump delivers 35 gallons per hour at 40 psi and is rated for a maximum operating pressure of 80 to 120 psi, matching the demands of high-pressure MPI fuel systems. It draws up to 78 amps at 43 psi and is built with a plastic pump body designed for internal fuel tank mounting. The inlet is threaded 5/8-18 UNF and the outlet is threaded 3/8-24 UNF, with an NPT connector type for secure fuel line fitting.

The 18-7330 is used across MPI high-pressure fuel systems on 350/5.7L, 454/7.4L, and 502/8.2L engines, including 454/7.4L & 502/8.2L (HU-WT) engine applications, and is cross-referenced to OMC Stern Drive and Volvo Penta fuel systems using the same OEM part numbers. Each Sierra fuel pump is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a reliable, drop-in solution for restoring proper fuel pressure and flow.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7330
• Fuel Delivery Rate: 35 gallons per hour at 40 psi
• Maximum Amp Draw: 78 amps at 43 psi
• Maximum Pressure Rating: 80 to 120 psi
• Inlet Connection: 5/8-18 UNF threaded
• Outlet Connection: 3/8-24 UNF threaded
• Connector Type: NPT
• Body Material: Plastic
• Mounting Type: Internal tank mount
• Weight: 1.46 pounds
• UPC: 808282112370

Fitment

• 1993-99 350/5.7L, 454/7.4L, & 502/8.2L Engines w/MPI - High Pressure
• 1996-99 454/7.4L & 502/8.2L (HU-WT) Engines w/MPI - High Pressure

Replaces (OEM)

• 3857650

Frequently Asked Questions

What engines does the Sierra 18-7330 fuel pump fit? The 18-7330 is designed for 350/5.7L, 454/7.4L, and 502/8.2L engines with multi-port fuel injection (MPI) on high-pressure fuel systems, including 454/7.4L & 502/8.2L (HU-WT) applications.

What OEM part number does this pump replace? This pump replaces OEM part number 3857650 and is a direct fit for fuel systems originally equipped with that part.

How much fuel does the 18-7330 deliver? It delivers 35 gallons per hour at 40 psi, sized for the flow demands of high-pressure MPI fuel injection systems.

What is the maximum pressure rating of this fuel pump? The 18-7330 is rated for a maximum operating pressure of 80 to 120 psi, consistent with high-pressure MPI fuel delivery requirements.

What size are the inlet and outlet fittings? The inlet is threaded 5/8-18 UNF and the outlet is threaded 3/8-24 UNF, both using NPT connector fittings.

Is this pump a genuine Sierra part or aftermarket? It is a genuine Sierra 18-7330 fuel pump, manufactured to meet or exceed the specifications of the original equipment part it replaces.

What is the pump body made of? The 18-7330 has a plastic pump body and is designed for internal fuel tank mounting.

How much current does the pump draw? The 18-7330 draws up to 78 amps at 43 psi during operation.

How much does the Sierra 18-7330 weigh? The Sierra 18-7330 electric fuel pump weighs 1.46 pounds.

Does this pump work in Volvo Penta or OMC Stern Drive applications? Yes, the 18-7330 is used in OMC Stern Drive and Volvo Penta MPI fuel systems that share the same OEM part number 3857650.

Is this an internal or external tank pump? The 18-7330 is an internal tank mount fuel pump, installed inside the fuel tank.

What is included when I order the 18-7330? Each order includes one Sierra 18-7330 electric fuel pump, ready to install as a replacement for OEM part 3857650.