I am a new diesel owner, 2002 6spd H.O., and all of these lift pump threads have really got me paranoid. I have a few quick questions. First, if the lift pump goes out, and ruins the injector pump due to lack of fuel pressure, will Cummins cover the injector pump under the 5yr/100k engine warranty? My second and final question is where do I check the pressure coming out of my lift pump and what should it be. I have a fuel pressure gauge I use to check injector rails on gas engines. It screws directly to a Schrader valve. Will this gauge work? ??? Thanks for the help and thumbs up to DTR!!!

 

Congrats on the new truck. If your lp goes out and takes the ip it will be covered. That is if you don't have any mods. There is a schrader valve on the side of the injection pump. It is the same as a 4 jic. I use a old r-12 ac line and guage to check mine.
Ideal pressures are

idle-15
wot- no less than 6 or 8 I think

Right now mine is
idle-13 ;D
wot-6
Welcome to the site ;D

 

I've seen lift pumps go out, causing a negative fuel pressure for months at a time the the VP44s lived to tell about it.

 

thanks for the help. going to try and check the pressure tomorrow. don't know if i will be able to check the WOT but i can surely check the idel pressures. thanks

 

Coyote556<br>First thing in preventing damage from a weak lift pump is to monitor pressure. If you don't go with an in cab set up, at the very least get a test gauge setup, with 5' hose, so you can check psi under load and full throttle. Some trucks run just fine with an almost dead lp, until the vp44 goes south. Monitor your pressures and you will now when it time for a new.<br>my nickel worth

 

You can buy a in-cab fuel pressure gauge very reasonable and set up on your a-pillar, their easy to hook up (and look nice too) then you can always monitor it, you my-as-well get a three gauge holder because a month on this site and you'll be buying more gauges anyway ( you'll see ) anyway good luck w/ your new truck!<br>call rod @ wildcat diesel, he did right by me ( in the links section under high perf.)

 

[quote author=Bart Timothy link=board=4;threadid=16122;start=0#151428 date=1056085584]<br>I've seen lift pumps go out, causing a negative fuel pressure for months at a time the the VP44s lived to tell about it.<br>[/quote]<br><br>Yep, and unfortunately, for every VP that survives for a long time without adequate fuel pressure, there is another one that doesn't (we're talking stock trucks).<br><br>I heavily recommend that fuel pressures be checked at every 10K miles (5K miles if your idle pressure is below 13 PSI), and once WOT pressures begin to drop below 5 - 7 PSI (7 PSI on modified trucks), its time to change out the lift pump. VP44s are too difficult to find and too expensive to replace to not take five minutes to check pressures.<br><br>Rod

 

guys, i really appreciate all the help.

 

well, my paranoia was not warranted. i checked my idle lift pump pressure today and it was between 15-16. from what i have been reading, this means i am good to go.