Have a 2002 GMC 2500 Duramax. Just put all new injectors in it. Drove 40 miles out of town and it started losing power. If you let off the accelerator it will gain a bit of power and when you try and accelerate again it does a nosedive and you can only get up to 20 mph. I was told it was the prime pump. Anyone have any answers? All help is greatly appreciated

 

Did you replace fuel filter?

 

Yes I have already replaced fuel filter

 

Might have a hose collapsed around the filter housing to ficm or the lines that come in on the driver side could be damaged where the black nylon braided part is. You wont be able to see any damage externally but they have a liner inside that can kink when the lines get bent over out of the way during injector job. If you can check vacuum on the system see if you have a restriction, if not you can use clear hose at the filter housing to check for air entering somewhere.

 

Thanks for the info lets see what that does