Okay guys I,m new to the forum and have my first question. I took my truck to the shop because it would start and idle . When I press the pedal it would rev. up and drop back down to an idle . With the pedal down or up it runs smooth , but doesn't accelerate .The check engine light is on . The mechanic changed the fuel pump , but it's still doing the same thing. It doesn,t always do it. Now he says it must be the injector pump . If the injector pump was bad wouldn't it be just that (bad ) and not run at all. I read how to check for codes and what I got is listed above. Can anyone help my from getting screwed ? Odviously the pump wasn't the problem . Should I be charged for the pump when that odviously wasn't the problem ? Oh yea it's 2001 , 130 k miles on it edge programer and all fluids and filters change on a regular basis.

 

Clear the fault code, turn the ignition key OFF for at least 60 seconds, turn the key ON. Without starting or cranking the engine check if P1688 resets. If P1688 resets at key ON, replace the injection pump. Transferpump failure usually will cause injection pump (high pressure pump) to fail because of lack of cooling and lubrication. I would suggest installing a pressure gauge with new pump so you can monitor the fuel pressure.

 

Thanks for the reply , but will it only act up sometimes ? I drove it yesterday back to the shop that put the fuel pump on it and it ran fine , but the check engine light was still on. How do you clear the codes ?

 

Pull the negative cable for a couple of minutes. That should reset the codes.

 

The injection pump on the 2001 does not always issue codes when it fails, nor do error codes always accurately indicate a failure.

They can fail and act erratically, and come back for quite a few miles; or can simply fail out of the blue and strand you with absolutely no warning.

I would recommend you go to Blue Chip Diesel's website and read their writeup on the VP44, and failures. Also, read their ditty on what should be in a good rebuilt pump, should you need one. It will save you from buying a pig in a poke and being back with more problems prematurely.

 

IP Pump is in its early stages of death. They will act erratically and then eventually will just die. Next stage if it doesn't die before then is starting will become hard and longer crank times.

As to the lift pump it was likely bad with that many miles and an edge requring more fuel than spec. It is a good idea is replacing the IP pump to replace the lift pump while your at it.