Dorman 904-138 Fuel Injection Harness

Reliable Fuel Injection Harness for Chevrolet and GMC Trucks

The Dorman 904-138 fuel injection harness is designed to provide a dependable electrical connection for fuel injectors in select Chevrolet and GMC heavy-duty trucks. Engineered as a standard replacement part, this harness ensures consistent fuel delivery and engine performance.

• Length: 10 inches for optimal routing
• Controls 2 fuel injectors with 4 wires
• Includes heat shield for protection against high temperatures
• Standard replacement grade for reliable durability
• Male plug/connector type for secure connections
• Package contains one injector harness repair

Durable Design and Compatibility Details

This fuel injection harness from Dorman is specifically compatible with Chevrolet and GMC models including Sierra 2500 HD, Sierra 3500, Silverado 2500 HD, and Silverado 3500. The 10-inch length and four-wire configuration allow for precise fitment and easy installation. The integrated heat shield protects wiring from engine heat, reducing the risk of damage and electrical failure. The male plug connector ensures a secure and stable connection to the fuel injectors, maintaining consistent fuel delivery and engine efficiency.

Common Applications and Problem Resolution

This fuel injection harness is used to restore proper electrical connectivity to fuel injectors, addressing issues such as:

• Intermittent or no injector firing due to damaged wiring
• Engine misfires caused by faulty injector connections
• Check engine light triggered by injector circuit faults
• Reduced engine performance from inconsistent fuel delivery
• Wiring insulation damage from heat exposure

Installation Notes and Tips

When installing the Dorman 904-138 fuel injection harness, ensure the vehicle is turned off and the battery is disconnected to prevent electrical hazards. Route the harness carefully to avoid contact with sharp edges or moving parts. Verify the male plug connector is fully seated to maintain a secure connection. The included heat shield should be positioned to protect wiring from engine heat sources. Consult the vehicle’s service manual for specific wiring diagrams and torque specifications.

Quality Assurance and Warranty Information

Dorman manufactures this fuel injection harness to meet or exceed OEM standards for fit, form, and function. The part is tested for electrical continuity and heat resistance to ensure reliable operation under normal driving conditions. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official documentation for complete warranty terms.