lift pump?? or something else

[mprmn08]

Well i got the trans done and back in changed all the fluids and filters pulled the truck out did a valve adjustment, fired it up and it ran for about 10 sec. then died. it was spittin and sputterin so i thought it was fuel and sure enough it was. stupid me forgot to fill the filter with fuel before i put it on and the truck sat for long enough the some fuel ran back from the lift pump back. so i filled the filter cranked for a while, primed the system and it still wouldnt fire. so i figured i got air in the injector lines which i did and i bleed them. finally got fuel comin out and im pretty sure my lift pump is shot but i dont know. is it possibly to an intermittent lift pump problem being that it is mechanical? sometimes work and sometimes not? i dont see why not but i dont wanna just buy parts and not really know. it is deffinatly something between the filter and the tank though i do know that much. not the IP. sorry for the essay but wanted to try and put in everthing. thanks in advance

chris

[Remps]

Did you get it running?If you gotta change your filter every two weeks ta keep it running down the road,yer lift pump is probably hooped.Hard to tell with no fuel pressure gauge.I would think that if you loosened or removed the bleeder bolt on the banjo bolt after the filter,the lift pump should squirt fuel out when you crank it over,tho I never tried it myself.

[cougar]

Bleeding the air out can sometime be rather frustrating. Patience is everything.
Start with bumping the engine until you can get a full stroke on the lift pump.
Open the bleeder past the filter and hand pump until you get bubble free fuel then close the bleeder.
Crack the line were it enters the IP and pump some more until no bubbles then tighten.
Now crack All the lines at the injectors. I give them about a quarter turn loose. Crank the engine over about 10 cranks. Look to see if you have fuel leaking from every injector. If not, crank some more. Once you have fuel at every injector, tighten the lines and clean up the mess.
Start is up and let it run for a few minutes to clear the rest of the air out.

[mprmn08]

Bleeding the air out can sometime be rather frustrating. Patience is everything.
Start with bumping the engine until you can get a full stroke on the lift pump.
Open the bleeder past the filter and hand pump until you get bubble free fuel then close the bleeder.
Crack the line were it enters the IP and pump some more until no bubbles then tighten.
Now crack All the lines at the injectors. I give them about a quarter turn loose. Crank the engine over about 10 cranks. Look to see if you have fuel leaking from every injector. If not, crank some more. Once you have fuel at every injector, tighten the lines and clean up the mess.
Start is up and let it run for a few minutes to clear the rest of the air out.

i did all that and would everyonce in a while loose pressure when tryin to prime at the lift pump thats why i thought intermittent lift pump problem. i would have pressure at the LP and start cranking and bleeding everything and next time try and prime the LP again and have no pressure at all there. If i do have to replace it im just gonna put an A1000 in and the good thing about that is i can get them at cost so i can get the pump and reg. for about $400. Which still is 400 more then what i wanted to be spending but it was gonna come eventually.

[TRENDZ]

I think you most likely have a leak before the lift pump, or a very low fuel level. I've noticed my old truck would start funny... long crank time before firing if it was very low on fuel

[mprmn08]

about 5/8 of a tank so i dont think its to low.

[cougar]

That sounds like a leak before the pump. Even if the check valves in the pump weren't sealing, it wouldn't drain out the line.
Because of a gel up this winter, I had to go through my system tank to injector. I replaced my pump at that time because of a diaphragm rupture. It took quite a long time to get it all bled out.

A Walbro FRB5-1 puts out 45gph at 8-11psi. No regulator needed. The run around $100.

[mprmn08]

i just picked up a low pressure piston lift pump and am gonna convert to that. i would like to stay mechanical as to stay away from electrical gremlins that seem to find my stuff im gettin ready to go put it on and hopefully fire it up today just to put it back in the garage and take the head off to o-ring, port, and stud it.

[cougar]

i just picked up a low pressure piston lift pump and am gonna convert to that. i would like to stay mechanical as to stay away from electrical gremlins that seem to find my stuff im gettin ready to go put it on and hopefully fire it up today just to put it back in the garage and take the head off to o-ring, port, and stud it.

Just remember that the VE's can't take a lot of inlet pressure before the front seal blows out. Keeping it under 15psi should be safe.

I planned on using the electric to "piggy back" the mechanical for priming and added fuel pressure when needed under power. Using a low pressure switch, the pump would come only if more was needed.

[peobryant]

i just picked up a low pressure piston lift pump and am gonna convert to that. i would like to stay mechanical as to stay away from electrical gremlins that seem to find my stuff im gettin ready to go put it on and hopefully fire it up today just to put it back in the garage and take the head off to o-ring, port, and stud it.

Just remember that the VE's can't take a lot of inlet pressure before the front seal blows out. Keeping it under 15psi should be safe.

I planned on using the electric to "piggy back" the mechanical for priming and added fuel pressure when needed under power. Using a low pressure switch, the pump would come only if more was needed.

He bought the low pressure piston pump. They don't put out enough pressure to blow the front seal off the VE.

[mprmn08]

ok i got the pump on today and tried priming it and i get any fuel to come out of the bleeder screw. the only thought is that its pulling air in possibly from a cracked line or something. am i wrong in thinking that? i even tried pressureising the tank and cant get anything to come up? any help would greatly appreciated as i am gettin very frusterated.

[Ace]

Run a temp line into a can of fuel sitting on the floor underneath it.

Narrow down which direction the problem lies.

[mprmn08]

Run a temp line into a can of fuel sitting on the floor underneath it.

Narrow down which direction the problem lies.

duh. sorry i got so frusterated last night working on it i didnt even think of that.