On Sunday afternoon my son came over and serviced his Jeep before Sunday dinner.
Last night we finished installing his new CP3 pump on his LB7 Duramax.
Some pictures of when we were diagnosing.
Clamped off and pressurizing the supply side to verify no leaks.
Hooked up clear line prior to filter head.
Clear line at the supply side of the CP3. No bubbles in either which proves no air leaks.
We determined the CP3 is passing too much fuel back through the cascade valve internally. It was borderline but with 262k miles on it my son wanted to replace it.
The FSM states to remove the coolant crossover casting but it is not necessary. The four bolts can be accessed without removing the crossover.
This lower passenger side CP3 mounting bolt can be accessed by loosening the coolant bypass hose mounting tab bolt and slightly shifting it to the side. The bolt will not come all the way out but it can be pulled out far enough to clear the block.
The intake Y-bridge is easy enough to remove to allow better access for pump removal. Look at how nice and clean a non-EGR diesel engine is, even with a quarter of a million miles.
Pump removed.
Re-manned pump ready to swap over mounting bracket with new O-rings.
Pump ready for installation.
Pump installed.
Going back together with new hoses.
And she’s back together. Better but still having an issue with delayed cranking. I think we need to face the fact that we have an injector or two leaking past the return ball seat. Time for more testing.
Mike