Engine/Transmission (1998.5 - 2002) loss of power

[Txredneck]

Is there any way that you can tell that you have a bad lift pump besides putting a pressure gauge on the truck? and if so what are the problems that you can tell?

 

[DavidC]

A Gauge is the only sure way. Preferably One you could watch while driving. The Lowest I would want to see would be between 8 & 9 psi at wot. At Least 12 at Idle and even at that I would get a spare which will put out 15-16 at Idle and no less than 10 at wot under load. Any other test method would be a guess.



Dave

 

[LSMITH]

A guage is the only way to tell for sure.



I would not worry about getting a new one right now unless it was going to less than 2 or 3 PSI. If it is lower go buy one, if not buy one when you get a chance. JMO.