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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Fuel Pump/Fuel System
333 messages, Last post on Dec 03, 2009 at 12:13 PM
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Have a 2001 GMC Sierra 1500,5.3L with 144k miles. Recently developed hard starting problem. No trouble codes present.Cranks with no start until 3rd attempt. Probably would start with one attempt if I didn't let up on starter. Prefer 3 short attempts to avoid damaging starter. Occurs after shutdown of approx 5 minutes or overnight. Will start OK if you shut down and restart immediately. Fuel pump and filter was replaced at 120k miles. Runs fine otherwise from idle to WOT. Have noticed after shutdown,can hear noise in the fuel tank that sounds like fuel pump is still operating or more likely pressurized fuel is returning to the tank. Replaced original plugs and wires since they were long overdue. Truck has run flawless since purchased new. Any ideas where I can start to troubleshoot ?
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I have a 96 GMC sierra that speeds up it's idle not at first,but as soon as it warms up,to about 1400 rpm. I also seem to have an excessive amount of vacuum or just very strong vacuum. Other than that it runs well. This is a 305 with central sequential injection. Any feedback is highly appreciated! Thanks |
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hi, i have a 95 Sierra as i took off from a stop sign it suddenly starting sputtering and then died,restarted it and got home after alot of effort.replaced the fuel filter,no difference.it will sit there and idle just fine,rev's up good just when i put it in gear it will bog down and then do a surge of running good,then bog down again.fuel pump or something else?i am at a loss,need some advice badly.thanks
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Replying to: coyotehunter (May 23, 2008 6:29 pm) The replacement was pretty expensive from what I remember. If this is the problem, a half of a roll of duct tape will work just as good as a new air duct! Good luck, let us know! |
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Yesterday out of the blue all of a sudden my truck started bogging down, and the fuel gage went from half a tank down to E so I turned around and pulled into the gas station put 20 bucks in and started out of town again....well it didn't stop it kept bogging down especially when I would go to take off....then it took forever to get home, cause I had to go really really slow to get up a hill and had to roll back down one cause it just wasn't going. I checked the fuel filter and it seems fine. Do you have any ideas??? There was no warning it just started bogging down when I accelerate. I'm going to check it out again here in a sec, any ideas would be greatly appreciated.....Thanks! it acts like its not getting enough gas or something.
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Replying to: jpmoore (Jun 01, 2008 1:44 pm)
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Replying to: mickeymouse2 (Jun 01, 2008 2:15 pm) |
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Strange problem. Noticed during warm weather fuel pump would not come one unless i reached under and "jiggled" the connection. then fine. I checked it yesterday and it is getting really Hot at the connector as the truck runs. I cleaned the connection and checked that the ground is still good. Fuel guage works fine. During winter I have less or no problems with this. Right now if you start and run for 10 minutes, the connector and grey wire (power) are very hot to the touch. The diagram shows a capacitor in the pump, what are chances it is bad and discharging all the time? After running for awhile and shutting down, I will have to "jiggle" connection again to restart. Trying to avoid new pump if possible. Thanks guys.
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Replying to: mac53 (Apr 08, 2008 6:13 am)
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