Sparta PN3186 Fuel Transfer Unit

Fuel Transfer Unit for Diesel Applications

The Sparta PN3186 fuel transfer unit is built for diesel fuel systems on select higher-mileage, earlier-model GM trucks. It is a direct-fit in-tank unit with a float arm, internal strainer, seal, and quick-connect outlet design for service on the fuel delivery side.

Compatible With 2001-2004 Chevrolet Silverado 2500 HD, 2001-2004 Chevrolet Silverado 3500, 2001-2004 GMC Sierra 2500 HD, and 2001-2004 GMC Sierra 3500.

• Fuel type: diesel
• In-tank fuel transfer unit with float arm
• Two quick-connect outlets
• Internal strainer included
• Gasket or seal included
• Female oval connector with 4 terminals
• Plastic housing
• Resistance: 40 ohms empty, 250 ohms full
• Outlet outside diameter: 0.500 in. / 12.6 mm
• Package contents: fuel transfer unit w/float arm, seal, instruction sheet

Fitment and Application Details

Sparta PN3186 is a diesel fuel transfer unit for select GM heavy-duty pickups. It fits 2001-2004 Chevrolet Silverado 2500 HD, 2001-2004 Chevrolet Silverado 3500, 2001-2004 GMC Sierra 2500 HD, and 2001-2004 GMC Sierra 3500. This part cross-references Carter P76668R for the same application.

As a fuel transfer unit, PN3186 manages fuel delivery from the tank and works with the sender-style resistance range used by the vehicle’s fuel level circuit. The in-tank layout, internal strainer, and quick-connect outlet configuration support a clean replacement on diesel-equipped Silverado and Sierra models.

Common Issues This Part Addresses

• Fuel delivery problems caused by a worn in-tank transfer unit
• Fuel level reading errors from a failing sender assembly
• Restricted fuel flow from a damaged or clogged internal strainer
• Leak concerns at the tank seal or outlet connection points
• Starting and drivability issues related to inconsistent diesel fuel supply

Installation Notes and Tips

Verify the connector style, terminal count, outlet type, and resistance range before installation. PN3186 uses a female oval connector with 4 terminals, a pin-style terminal design, and two quick-connect outlets. Confirm tank access, clean the mounting area, and inspect the fuel lines and electrical connector before reassembly.

Because this unit is designed for in-tank use, proper sealing and alignment are important during installation. Follow the included instruction sheet and confirm the float arm moves freely before closing the tank.

Quality Assurance

Sparta is distributed by Delphi, an OE fuel-system supplier, and is positioned for higher-mileage and earlier-model vehicles where fit and performance matter. PN3186 is built as a diesel fuel transfer unit for the listed Chevrolet Silverado and GMC Sierra applications.