Your old unit MUST be received by ourselves prior to despatch of your replacement unit, MUST be undamaged and of the same type as the requested replacement.


Our reconditioned service exchange fuel pumps are overhauled to original manufacturer's specifications and calibrated on our in-house Hartridge Injection Pump Test Bench.


Fuel pump failures can be diagnosed by any of the following symptoms:

  • Poor starting

  • Excessive Smoke

  • Lack of power

Fuel pump failures can be caused by any of the following:

  • Incorrect grade of fuel

  • Water in the fuel

  • Dirt and other contaminants in the fuel (including deliberate sabotage !)

In the majority of cases the most economic option is to replace the entire pump with a service exchange pump (select the correct pump for your application from the options below).

It is essential when removing the fuel pump from the engine, that the shims between the fuel pump body and the cylinder block are retained for re-use. Do not send the shims to us with the fuel pump for replacement (they are known to stick to the pump and should be removed).

The reconditioned pump is not supplied with shims. The original shims should be reinstalled, the spill timing checked and the shims added or removed as necessary. 

Important: When reinstalling the fuel pump, care must be taken to ensure the rack pin is correctly engaged with the governor fork. This can be facilitated by using the stop lever control to align the slot in the governor fork with the rack pin on the fuel pump. Failure to do this will result in damage to the governor fork.  

Our unique Jem Reference and serial number system ensures total traceability of each build.


Each injector is fitted with a new nozzle and the pressure set to manufacturer's specification. The spray pattern is also verified that it is correct for the specific nozzle. Our nozzles are uniquely marked for traceability and quality assurance.