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Diesel Injection Pump Repair

by Andrea Stein

A diesel injection pump refers to a device used to pump or send fuel into the diesel engine’s cylinders. Diesel injection pumps can malfunction for numerous reasons; some basic troubleshooting techniques usually resolve the problem.

Air in Fuel Lines

A loss of pressure results when air gets in the fuel lines of a diesel injection pump, causing engine starting or stalling problems. Bleeding the fuel system of air and checking for any leaks in the lines -- and replacing any lines as needed -- typically corrects the pump problem.

Injector Clogging

Diesel injectors clog over time due to fuel sediment buildup in the nozzles. Perform an injector overhaul every 100,000 to 150,000 miles, or as needed, to restore proper diesel injection pump function.

Clogged Filter

A clogged fuel filter can keep a diesel injection pump from gaining access to the fuel necessary to keep the engine running. The fuel filter should be regularly cleaned of any dirt or sediment and replaced.


About the Author

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.

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