Fuel Transfer Unit for Diesel Applications

The Sparta PN3191 fuel transfer unit is built for diesel fuel delivery systems on select Chevrolet Silverado HD and GMC Sierra HD trucks. Backed by Delphi OE fuel-supply expertise, it is aimed at higher-mileage and earlier model vehicles that need a direct-fit replacement for the in-tank transfer assembly.

• Diesel fuel transfer unit for in-tank mounting
• Includes fuel transfer unit with float arm, tank seal, and instruction sheet
• Plastic housing with 4-terminal blade connection
• Female oval connector with male terminals
• Internal strainer included
• Quick-connect outlet with gasket or seal included
• Resistance: 250 ohms empty, 40 ohms full
• Sparta PN3191 cross-references Carter P74700R for the same application

Fitment and Application Details

Compatible with diesel-equipped trucks that use an in-tank fuel transfer unit, Sparta PN3191 is listed for 2004-2008 Chevrolet Silverado 2500 HD, 2007-2008 Chevrolet Silverado 3500 HD, 2007 Chevrolet Silverado 2500 HD Classic, 2007 Chevrolet Silverado 3500 Classic, 2004-2006 Chevrolet Silverado 3500, 2004-2008 GMC Sierra 2500 HD, 2007-2008 GMC Sierra 3500 HD, 2007 GMC Sierra 2500 HD Classic, 2007 GMC Sierra 3500 Classic, and 2004-2006 GMC Sierra 3500. This part number is also referenced as PN3191 in replacement searches for Silverado HD and Sierra HD fuel system service.

Common Problems This Part Can Address

• Fuel delivery issues caused by a worn in-tank transfer unit
• Incorrect fuel level readings from a failing float arm assembly
• Restricted diesel pickup flow from a degraded internal strainer
• Hard starting or stalling related to weak fuel transfer performance
• Fuel system leaks at the tank seal or outlet connection

Installation Notes and Tips

Verify diesel fuel system configuration, connector style, outlet type, and resistance values before installation. The unit uses a blade terminal layout, oval female connector, and quick-connect outlet, so matching the original electrical and fuel connections is important for proper fitment. Confirm tank access and inspect the fuel tank sealing surface during service.

Quality Assurance

Sparta is distributed by Delphi, an OE full-line fuel supplier with application knowledge focused on fit and performance for higher-mileage and earlier model vehicles. PN3191 is built as a replacement fuel transfer unit for the listed Chevrolet Silverado HD and GMC Sierra HD applications.