Ill say first: this is not your typical leaking filter housing problem most people have.
So my truck had a hard start then die a few weeks ago. I have thrown lots of parts at it already and i do not know what needs to be done next.
First thing i noticed was the prime plunger was not building up the pressure it used to. I remember it used to get pretty hard now it pumps with ease as long as you pump it. Got my self a rebuild kit. No fix. Took the filter head out and bench tested it by running the inlet hose in a 5 gallon tank and plugging the outlet. Held pressure with no leaks for 10+ minutes. I have put it back in the truck with he same 5 gal tank as supply and the outlet going to the Test port line like stock. Wont build pressure. You can hear the fuel moving around in the lines but the plunger never gets hard. Could there be a bad check valve in the cp3 causing all the fuel to return to the tank before building prime?
Truck takes about 10 seconds of cranking to start. Will run for about 30 seconds with lots of knocking then dies off. I watch my edge as desired rail pressure remains around 6kpsi. The actual starts at 0kpsi and slowly builds up over the 10 seconds of cranking until it hits about 4kpsi then starts. Immediately shoots up to 6kpsi then slowly looses pressure until it dies.
The reason for the 5gal tank was to eliminate the lift pump and fuel tank pickup as being possible problems. Acts the same running from the tank to running from a 5 gal tank.
Is there something im missing on how this system works. I DONT know what needs to be done next PLEASE HELP!
So my truck had a hard start then die a few weeks ago. I have thrown lots of parts at it already and i do not know what needs to be done next.
First thing i noticed was the prime plunger was not building up the pressure it used to. I remember it used to get pretty hard now it pumps with ease as long as you pump it. Got my self a rebuild kit. No fix. Took the filter head out and bench tested it by running the inlet hose in a 5 gallon tank and plugging the outlet. Held pressure with no leaks for 10+ minutes. I have put it back in the truck with he same 5 gal tank as supply and the outlet going to the Test port line like stock. Wont build pressure. You can hear the fuel moving around in the lines but the plunger never gets hard. Could there be a bad check valve in the cp3 causing all the fuel to return to the tank before building prime?
Truck takes about 10 seconds of cranking to start. Will run for about 30 seconds with lots of knocking then dies off. I watch my edge as desired rail pressure remains around 6kpsi. The actual starts at 0kpsi and slowly builds up over the 10 seconds of cranking until it hits about 4kpsi then starts. Immediately shoots up to 6kpsi then slowly looses pressure until it dies.
The reason for the 5gal tank was to eliminate the lift pump and fuel tank pickup as being possible problems. Acts the same running from the tank to running from a 5 gal tank.
Is there something im missing on how this system works. I DONT know what needs to be done next PLEASE HELP!
