Today my truck started bucking when I was driving. I know my lift pump was weak but I've been strapped for cash so I haven't changed it yet but now I think I'm paying for it. Just wondering if the bucking is characteristic of a blown VP44? Also when I was driving I noticed that when I curved to the left it really lost power and ran rough but when I curved right it ran much better, any ideas on this?

i suggest only make right turns! no really is your fuel level low, the fuel might be running away from the pick-up causing it to suck air that would cause a engine hesitation.

Fuel gauge sender failing? Mine failed at a 1/2 tank and the only clue that gave me for it was the fuel pressure going up and down like a yoyo.

Don't forget to check for codes. My truck just very smoothly died off to 0 rpm when mine ran out of fuel. My fuel gauge with still showing a 1/3 of a tank but I was going down hill too.

Thanks for all the ideas. I guess I'd be surprised if it was low fuel because I drove a while after it started just to get home and it never got better or worse. Will check for codes and am not driving it any more till I get a lift pump installed.

Just be careful - I had bucking in my truck above certain speeds and it was due to a restriction in the 'out' line from the fuel tank. It was pinhced off. I my case it ruined my vp44 - but I had the death code p0216. etc I would say check your lines and flow/volume first before throwing $1000k at something. Cause if you do have a restricted line - guess what - you'll kill the new one.

I know the flow is poor cuz i pushed the pin in on the test port on the back of the filter housing and with the engine just idling the fuel only dribbled out. I will certainly check the fuel lines.

Typical flow restrictions will show up as a huge fall in fuel pressure from idle to WOT... If system is in good shape there should be only like 2-3 PSI drop from idle to WOT..

Sounds like you need to invest in a fuel pressure gauge and a good fuel system at the same time. There really isn't any guaranteed VP failure symptoms. There are some more common ones, but they all can act different. Some throw codes, some won't, some have the dead pedal, some don't, some become hard to start, some don't, there just isn't any "one" they do. So it is possible the bucking could be caused by the VP!

I checked my codes and all there is is the companion code P1693. Does that mean that the VP44 will be ok? Thanks to THRacing there's an Airdog 150 coming my way:thumb1:

I checked my codes and all there is is the companion code P1693. Does that mean that the VP44 will be ok? Thanks to THRacing there's an Airdog 150 coming my way:thumb1:

There should be another code in there... You need to get a scanner or take it to AutoZone and have them check and see. The companion code is suppose to tell you that an another code is in the computer.