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Another truck question-fuel problem

F

farmer boy

Well-known Member
I was driving home from work and the truck started to act like it was starving for fuel. Press on the pedal and it would lose rpm's and power. Let up and it would get both back. You could go to a certain point and go any past that and it would lose rpm's or die. It's to the point that it's on the side of the road and won't start. I just replaced the fuel filter to see if that would help and it did, I got 3 miles and it died and won't start. Still had a heck of a time getting it started and it still acted like it was starving for fuel. Pump is 2 weeks old and comes on with the key, builds pressure, and shuts off. The truck was running great up until now. I can't see how any dirt in the line would get past the filter, and when I had the filter off I cycled the pump a few times and fuel came out fine. The pump also had good pressure up until this happened. The truck started alot better after the pump was replaced, which I figure was good pressure. May have to do a pressure test or something.

Should add it's a 1997 GMC Sierra with a 305
 
Replace with a new GM pump or a aftermarket??

I'm a Ford parts man, I know it's another brand
but we have had all kinds of problems with
aftermarkets pumps?? I believe in OEM regardless
of the make...
 
check the pressure on that new pump--pressure can appear to be ok gushing out of line--i think that gm pump can be off specs just a little & shut you down--also wiring harness & grds can be suspect on your truck---
 


When was your last tune up? I replaced an intank pump for a guy. The pump was bad. Wouldn't start afterwards.....I decided to check the plugs. With the "current tune up" getting the correct fuel flow it was flooding. Fresh tune up and it ran like new.......the gap was supposed to be .045 and was .060 when I pulled the plugs.

Rick
 
I had one that was starving and thought it was fuel. Actually was plugged catalytic converter. Didn't realize all that poor fuel mileage was coming from that. Started starving for fuel(I thought), backfired sometime and finally shut down. after backfire it would run decent for a day or two.
 
Wife took my Blazer to town, bought a few groceries, came out and car woudn"t start. Couldn"t hear tank mounted electric fuel pump. Dragged it home, monkeyed, pounded on tank, etc. - no go. Checking fues panel for fuel pump, none, but did find a fuel pump relay. Same as horn relay. Swapped them. Fuel pump works. Horn worksCar runs. Wanna explpain that one to me?
 
I would second the pump relay. Should be up on the right side of the firewall, along with a couple of others. That cured the same problem on ours a few years back. MK
 
Yep,

Every mechanic in the land knows of this phenomenon. Aftermarket electric fuel pumps just do not work. Ever.

Countless times I've seen 'em back off the lift with an aftermarket pump, which the owner demanded due to the cheaper cost, die and never move again until an OEM pump was installed.

If you got 2 weeks out of it, I’d say that you’re one of the lucky ones. :>)

Allan
 
Not long ago someone had GM troubles and it was a pinched fuel line. His finally leaked a little so he found it.
 
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