Dorman 904-7937 Diesel Primer Pump

Dorman 904-7937 Diesel Primer Pump

Dorman 904-7937 is a mechanical diesel primer pump built to match the fit and function of the original pump on specified applications. It uses an aluminum housing, a sliding design, and a single port layout to support reliable fuel priming in diesel fuel injection systems.

For diesel service on vehicles such as Ford F-Series and Chevrolet Silverado applications, this primer pump is a direct replacement option for restoring proper fuel delivery after service or component wear. The Dorman 904-7937 is also cross-referenced to 1841397C91 for the same application.

Key Features

• Mechanical diesel primer pump for fuel injection system service
• Aluminum construction for standard replacement use
• Sliding pump design with one port and 1 in inlet size
• Includes gasket for sealing at installation
• Working pressure rated at 20 PS, with a maximum pressure of 100 PS
• Designed to match original fit and function on specified diesel applications

Detailed Description

This diesel primer pump is engineered as a standard replacement for diesel fuel systems that require manual priming after filter changes, fuel service, or air intrusion. The aluminum body, mechanical operation, and included gasket support a straightforward replacement on the intended application. With a 0.63 in port outside diameter and a single-port configuration, Dorman 904-7937 is built for direct service in diesel fuel delivery systems where consistent priming performance matters.

When servicing Ford F-Series or Chevrolet Silverado diesel models, using the correct primer pump helps restore fuel system priming and maintain proper startup behavior. Dorman 904-7937 is intended for specified diesel applications where the original pump has worn, leaked, or lost priming capability.

What It Helps Fix

• Hard starting after fuel filter replacement
• Loss of prime in the diesel fuel system
• Fuel leakage at the primer pump assembly
• Poor manual priming response during maintenance
• Wear-related failure of the original mechanical pump

Installation Notes and Tips

Confirm the original pump style, port size, and mounting configuration before installation. Replace the sealing surface with the included gasket and inspect nearby fuel lines and connections for air leaks or contamination. This part is a mechanical sliding primer pump, so verify that the vehicle uses the same pump type and inlet arrangement before ordering. For Ford F-Series and Chevrolet Silverado diesel service, match the application details to the original component and compare the part number 904-7937 against the removed unit.

Quality Assurance

Dorman designs this replacement pump to match original fit and function on specified applications and to provide dependable service in diesel fuel delivery systems. The part number 904-7937 is built as a standard replacement component for diesel primer pump service.