Common diesel fuel pump repairs include cleaning and repairing the injection nozzle, electrical adjustments and repairs, and complete replacement of the pump with remanufactured or rebuilt units. Typically, a non-functioning or damaged diesel fuel pump is replaced rather than repaired. The internals of the pump are not usually repaired.
Diesel fuel pumps with dirty or damaged injectors can be repaired by most diesel repair shops to optimal operating performance. For many other repairs or defects to the fuel pumps, the pump is swapped out for new, remanufactured or rebuilt unit. Original equipment parts are typically used for rebuilt units, and defective units are sent to specialists for rebuilding.