CRD Not starting after driving

WWDiesel · **Posted:** Sun Oct 17, 2021 9:30 pm

With an intank lift pump properly installed and wired, there should NEVER be any air trapped in the fuel lines leading up the CP3 injection pump unless you installed a new non-primed fuel filter.
With the intank fuel pump running, there should be approx. a 13-15 psig of fuel pressure head constantly feeding the suction to the CP3 injection pump.
If for any reason, air were to somehow get entrained in the fuel lines and / or fuel filter leading up to the suction side of the CP3, it would be immediately evacuated/forced back to the fuel tank by the Cascade Overflow Valve.

Quote:

Cascade/Overflow Valve: Located on the side of CP3 injection pump.
Provides and regulates lubrication fuel to internal parts of the injection pump and regulates the fuel pressure to the fuel quality solenoid valve on the back of CP3 injection pump.
Also, controls the amount of fuel being returning to the fuel tank via the fuel return line.

jvecchione · **Joined:** Sat Jan 06, 2018 2:23 pm **Posts:** 33

I did put in a new fuel filter before the lift pump install, but i made sure to fill it with fuel. Could this be caused by a cracked filter head allowing air to be sucked in?

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WWDiesel · **Posted:** Mon Oct 18, 2021 1:23 am

jvecchione wrote:

I did put in a new fuel filter before the lift pump install, but i made sure to fill it with fuel. Could this be caused by a cracked filter head allowing air to be sucked in?

IF your filter head was cracked or you have a leak anywhere else, fuel would be leaking out since the entire fuel system is under about 14 psig all the way from the lift pump inside the fuel tank to the back of the CP3 injection pump. With a properly operating intank lift pump, there is NO way air can be sucked into the fuel system.

CRD Not starting after driving

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