Stumbleing and a few stalls. Lift Pump agian? [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: Stumbleing and a few stalls. Lift Pump agian?


danny325is
08-03-2009, 05:15 PM
Hello All,

I have replaced and relocated my PMD about 1 year ago(less than 5,000 miles).
About 6 months ago I also replaced the lift pump(500 miles).
5 days also I got my A/C working again(compressor clutch)

Yesterday was the first time I had taker the truck out for longer than 30 miles since I fixed the PMD. I was helping a buddy move at it was after about 100 miles I stopped at a red light and the when I went to pull away the truck stumbled. About 10 miles later at anther intersection the truck stalled., but started right back up.

On the trip back home it stumbled a few times, then after about 100 miles it stalled.

Today I took if for a quick 10 min run and it stumbled and stalled. it seems to always stumble when I floor it.

Today I replaced the fuel filter and did the lift pump test. When I was replacing the filter it seemed fine. I went to bleed it and fuel came out the top and all. Then I tried using the t-fitting and no fuel came out and the truck died. After a few cranks the truck started again. I cracked the bleed cap on the filter and no fuel came out and the truck ran for a few mins before stalling.

Could it be an intermittent lift pump issue? are lift pumps known to fail so quickly. Could it be something else?

Thanks for your help!

axiom
08-03-2009, 05:23 PM
check your OPS sounds like its got your lift pump running intermittently

vail426
08-03-2009, 06:15 PM
check your OPS sounds like its got your lift pump running intermittently

X2

danny325is
08-03-2009, 08:44 PM
I replace the OPS and it seems much better now.

for those replacing the OPS make sure you read this http://www.dieselplace.com/forum/showthread.php?t=274684&highlight=OPS+replacement