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My truck was running like its missing and throws a code for the fuel pressure regulator which i just changed. I pull the fuse for the lift pump and it runs good and no codes.

Any ideas why it does that? It seems like the lift pump is putting out way to much pressure.
 

LHN...We ARE the Joneses
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It seems like the lift pump is putting out way to much pressure.
It's more common than you think.
Volume, not pressure, the CP3 really doesn't need more than 3-4 psi @ idle.
Some will say 8-10 at most, but it screws with the FPR.

Rig up a test gauge at the fuel filter bleed port and see what it's shoving forward.
 

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what lift pump are you running?
 

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It's more common than you think.
Volume, not pressure, the CP3 really doesn't need more than 3-4 psi @ idle.
Some will say 8-10 at most, but it screws with the FPR.

Rig up a test gauge at the fuel filter bleed port and see what it's shoving forward.
I'm so glad I listened to you about the Kennedy pumps.
 
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