Truck Repair: cummins engine cuts off, cummins n14, pulsation damper

Question
QUESTION: Dear Waheed

My computer switched off before l concluded, I have a cummins n14 truck, it runs for a short while and if l try to rev it cuts off. I have changed filters, blown the pipes to the tank but the problem still persists.I have noticed that the fuel will be low in the filter when it cuts off. My gauges are all fine and this engine is a 1996 non celect. I need your help.

ANSWER: Hi, Wilson, Did this problem start after changing the filters? If so, you may need to check the following:
1. Is the fuel filter original fleetguard or proven alternatives.
2. The 'o' seal on top of filter ok and not twisted.
3. Did you overtighten or undertighten the fuel filter.
4. Did you fill up the fuel filter with correct diesel fuel prior to fixing it.
5. Did you notice any fuel leakage on the fuel inlet pipe or return pipe.
6. If you have a check valve on the fuel line, check that it opens in the direction of arrow etched on it.
If all the above have been confirmed ok,
Then it is highly likely that your PT fuel pump gear pump is worn out and needs replacement and recalibration of PT pump.
Hope these can resolve your problem.
Regards,

---------- FOLLOW-UP ----------

QUESTION: Dear Waheed,
I have checked all the above you suggested and everything seems fine. Is the fuel pump gear a replaceable part? And is recalibration a necessity whenever the pump is removed?

Kind regards

Wilson

Answer
Wilson,
The(spur gear pump) is a replaceable part of the PT pump.
Accesss is gained to it by removing 2 allen screws 3/8" connecting the pulsation damper to the gear pump and then remove 4 same allen size screws that connect the gear pump to the housing. The spur gear pump are in different sizes, I hope yours will be a 3/4" gear but you need to confirm.

It is advisable to rekit the PT pump when you are doing this type of exercise although it is not absolutely necessary as long as correct replacement gaskets are used by someone adept at rekitting work.

Recalibration is important to ensure that rekitting is properly done to ascertain that the calibration specs are met to ensure that pump run ok.

Hope you find the above useful.