still having problems
 

alright so heres what my truck is doing. it runs great when it is cold for the first 10 min. maximum. then it strats to lose power and sputter like it is running out of fuel or maybe getting too much fuel. it also blows a :edit: load of white smoke. i changed the lift pump, the electric inline pump, and the filter. that did absolutely nothing. could it possibly be a bad injector.

I'll bet you have a fuel leak. sounds like air is getting in teh system somewere. How do your fuel lines look?

they all look pretty good from what i could see. it would probably be pretty hard to tell thought since it is sucking air it wont be leaking any fuel

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if i do have a hole in a line it would have to be before the lift pump to suck air right?

It would be up by the tank or down by the lift pump. Do you have a Fuel pressure gauge?

no i dont

This is an instance where a fuel pressure gauge would be very, very valuable. I'd install one just for this diagnosis.

I had very similar problems, and it was a multi-monthlong nightmare that sucked lots of hours and money. If I had a fuel pressure gauge and a sightglass going into the injection pump, the diagnosis would've taken an hour tops.

1stGen.org :: View topic - Fuel Gremlins
1stGen.org :: View topic - The Return of the Fuel Gremlins

Ultimately, I found out it was my injection pump. I don't know what inside the injection pump causes the problems, but they went away only after I replaced the pump.

Otherwise, I chased imaginary gremlins all the way from the tank sender, replaced all my fuel line, replaced my lift pump, replaced my filter O-rings, and racked up so many tows that AAA stopped towing me.

If you see no bubbles in the sight glass going to the IP, good fuel pressure at the IP, and it's an intermittent problem only manifesting when warm, then it damns the IP.

I don't think it's something as simple as a seal leaking air in the IP either, I think it's head, rotor or sleeve wear preventing fuel from pressurizing properly after the fuel gets thin and the heat warps the pumping components slightly.

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I asked a pump guy and he said that my problem, and what can possibly be your problem, isn't a worn pressurizing component, but a wearing or broken return spring.

broken return spring is a common problem on these truck, especially when they are cranked up to the max.....

so basically what you are saying is i need to look for a new injection pump.

alright i dropped my tank and changed the screen on the pickup tube, i replaced the line from the tank to the lift pump and i put another new fuel filter on it. i just put a new lift pump and electric inline pump on it a week ago but i still have the same problem only ten times worse. what do i do!!! :argh:

i finally got it fixed :U: