Question about 1999 GMC Sierra

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Hard start after warm. no light on. Fuel pressure good. fuel filters replaced. I have to floor it to start then takes awhile to catch. acts like running out of gas. Then works again.

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  • 401 Answers

Sounds like it's somehow getting flooded.

Posted on Oct 21, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

wdmb08
  • 34 Answers

SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system

I would check the fuel lines themselves and make sure there is no blockage. If not you might want to check your fuel injectors and see if they need to be replaced. also make sure you didnt install fuel filter backwards.

Posted on Nov 20, 2008

  • 2039 Answers

SOURCE: hard starting after sitting awhile

if before you start if you hold the gas pedal just a bit does it start faster if it does its our idle air control valve that defective (iac) let me now pierre

Posted on Jan 25, 2009

  • 202 Answers

SOURCE: 98 gmc jimmy loses power to a stop

the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.

Posted on May 22, 2009

  • 15 Answers

SOURCE: 1995 safari van w stalls when giving it gas.

maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

Posted on Sep 01, 2009

  • 12104 Answers

SOURCE: my 99 gmc sonoma wil start and drive fine untill i

if no codes yet check and clean egr valve ,pcv valve,air filter and/ fuel pump and pressure regulator may b dropping under load

Posted on Oct 27, 2009

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My truck starts then after warming up when i put it in gear it stales out and want start, ecept when i haold throttle to the floor and then acts like it is flooding


george, 1st did you replace the fuel filter , take it off and shake it and dump it out into a bowl to see whats going on in your fuel tank, then a pressure fuel test would be nice, and then a spark test.. could be coil or the tfi on the distributor .

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Hi, this sounds like a bad fuel pump. I would have the fuel pressure checked. Sometimes Autozone will let you borrow a fuel pressure gauge to check your fuel pressure. Just unscrew the cover from the pressure port on the fuel rail and screw on the pressure gauge. Put a rag over your hand while screwing it on to avoid getting fuel sprayed around. Lay the gauge in a safe place and start the car. Read the gauge, record the reading, turn the car off and remove the gauge. If the pressure is less than 35 psi, you need a new fuel pump. Please let me know if you have questions, and thanks for using FixYa.

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1 Answer

When i go get gas and i try to start my car it acts like it dont wanna start. Then when it do it acts like it dont want to catch speed.


Have you ever had the fuel filter replaced? also have a fuel pressure test done on your car, you could either have a fuel pump or pressure regulater problem..
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If fuel filter hasn't been changed lately, I'd try that, as well as get a fuel pressure test done on it when warmed up to point where it normally would start to act up. Not unusual for fuel pumps to start losing pressure when warmed up /hot .

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I have a 1999 chevy express 1500 van with 5.7L engine. When engine is not hot it will not start without starting fluid, when warm starts ok. After it is started it runs fine under normal driving but if I...


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it is very possible and i can tell you a way to help you see if that is the issue. after your car has sit a while (as long as it usually takes before it acts up) jump in the vehicle and turn the key to the postion just before the vehicle begins to turn over when all the dash lights come on. when the key is put in this position the fuel pump runs for a few seconds and then stops until vehicle is cranked, allow the pump to run for 5 seconds then turn the key back off. then return the key to the "run" postion i mentioned before and wait a few seconds then try to start it. if it fires right up you have allowed the vehicle to build fuel pressure before you started it, indicating you have a fuel pressure issue and you are most likely looking at a weak fuel pump.

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Feb 17, 2009 | 1999 Chevrolet C/K 2500

1 Answer

1995 Ford F-250 replaced fuel filter and alternator, but the truck runs for a few miles then it stalls...or acts like it is out of fuel. it will not start until it has been setting for awhile


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