Delphi EX631057 Fuel Injector

Delphi EX631057 Fuel Injector Overview

The Delphi EX631057 is a remanufactured diesel fuel injector built for light-duty diesel fuel injection systems. It is a direct replacement for select 1989-1990 Dodge D250, D350, W250, and W350 applications, with OE-based engineering informed by Delphi’s long history supplying original equipment to major automakers.

For Dodge D250 and D350 diesel service, as well as W250 and W350 trucks, this injector supports accurate fuel delivery in a standard replacement format. The EX631057 part number is also referenced in cross-application listings for diesel injector service.

Key Features

• Fuel type: diesel
• Remanufactured standard replacement injector
• Light duty diesel injector system type
• Metal body construction
• Clamp w/bolt attachment method
• Package contents: fuel injector and instruction sheet
• OE-informed design from Delphi’s aftermarket and original equipment experience

Product Details

Delphi EX631057 is a reman diesel fuel injector engineered for light-duty diesel applications where consistent atomization and fuel metering are critical. It is built with a metal body and uses a clamp w/bolt attachment method, making it a direct-service replacement for the specified Dodge diesel trucks. The EX631057 part number appears in interchange listings, and this injector cross-references Standard Ignition FJ253 for the same application.

Compatible With 1989-1990 Dodge D250, 1989-1990 Dodge D350, 1989-1990 Dodge W250, and 1989-1990 Dodge W350 diesel models. Search terms such as 1989 Dodge D250 fuel injector, 1990 Dodge W350 diesel injector, and Delphi EX631057 reman injector align with this application coverage.

Common Issues This Injector Can Address

• Hard starting on diesel engines
• Rough idle caused by uneven fuel delivery
• Excess smoke from poor injector performance
• Loss of power under load
• Fuel metering inconsistency in aging injector systems

Installation Notes

Verify injector fitment by year, make, model, and diesel fuel system before installation. This injector does not include mounting hardware, gasket, seal, or retainer clips, so inspect the existing hardware and sealing components during service. Clean the injector bore and surrounding area before installation, and follow the included instruction sheet for proper service procedures.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and technical knowledge developed through more than a century of original equipment experience. The EX631057 is a remanufactured standard replacement injector intended to meet the needs of diesel service work on select Dodge D250, D350, W250, and W350 trucks.