Engine/Transmission (1998.5 - 2002) Goofy fuel pressure

[FBeuthien]

Just installed the gauges and the fuel pressure sits at 5lbs for the first 3 or 4 miles then goes up to 10 to 12 never more. Any ideas?

 

[SEmerson]

lift pump going out.

 

[isb360]

Could be the bypass valve on the lift pump, but either way, it's going south. Invest in the $150 from Cummins and get a replacement ASAP.



Tim

 

[CEpp]

u know mine starts out about 9-10 psi but if im in traffic or stop and go for a while it will rise, sometimes as much as 17-20 psi. but if i shut it off and restart, its right back down to 9-10 psi. any clues? is it the bleed off valve on the side of the vp44?