When i want to start my truck in the morning or even let it sit for like an hour its very hard to start and i have to bump the key to let the fass run then it will start. i put it in the shop and they said it needed a new computer so i did that and it still didnt fix the problem it has a brand new vp-44, it has 20 psi on the fuel when running. imput please i am beating my head against the wall trying to figure this out.

 

my truck is doing the same thing i have to bump the starter to get it to start i have no clue what it could be.

 

Does it run fine after it starts?

 

your getting air in the system and it's not staying primed.

 

So I just need to check all the lines coming from the tank or what?

 

Ok update on the truck i have checked every fuel line that the truck have and im not getting any air anywhere but im am throwing two codes p1693 and p1694 what are they if anyones knows

 

P1693 (M) DTC Detected in PCM/ECM or DTC
Detected in ECM
A 9Companion DTC9 was set in both the ECM and PCM.


P1694 Fault In Companion Module No CCD/J1850 messages received from the powertrain
control module-Aisin transmission


P1694 (M) No CCD Messages received from
ECM
Bus communication failure to PCM.

 

So what do them mean?

 

The fault code that we need to be concerned about is P1694, it means that there is a communication problem between the ECM(Cummins controller) and the PCM(powertrain control module) . The modules communicate over the ccd bus. The ccd bus is a two wire communication system that allows the computers to talk to each other. This ccd bus is going down and causing your problems.

The first thing I would check is the main large connector in the fuse box in the engine compartment. Make sure the connector is bolted down all the way and you can't pull it up. I am thinking we are losing a power or ground to the ECM and we need to start by checking that connector and make sure all the fuses are inserted all the way.