Engine/Transmission (1998.5 - 2002) Is this normal?

[Black-Smoker]

I installed a new lift pump two days ago and it was dead on at 15 psi idle now it is only at 12 psi idle. Is this normal I only put 200 miles on the truck.

 

[Horsepuller]

I don't think that is normal, in otherwords to be 15 psi and now 12 psi. But I wouldn't worry about it unless it continues to drop. My gauge still reads 15 at idle but it doesn't reset to zero when the truck is off. Oh well, nothing is perfect. I'd be more concerned with the pressure when the engine is underload.

 

[KYLE4]

If it does go bad the stock lift pumps by cummins have a 90 day manufacture warranty

 

[SnoKing]

I just installed a Di Pricol fuel pressure gauge and noticed that pressure is down a couple lbs when the grid heater are cooking. Goes up and down with the heaters. SNOKING