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Have a GMC 99 Sonoma p/2Wheel Dr have gas supply issue has gas to motor pressure looks good but won t start,will run if spray starter fl in carb then dies ???

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  • Expert
  • 126 Answers

Was thinking the same as Stephen. I had this problem with a 95 blazer a couple months ago. It will appear to have enough pressure just by looking at it but if it's not atleast 63-65 lbs of pressure to the spider injection setup then the nozzle tips will not open. The fuel pump may be coming on but the o-rings inside the pump go bad over time and quit putting enough pressure to run the engine.

Posted on Apr 09, 2015

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  • GMC Master
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Just for the record, thats the throttle body.
Have you checked to see if the injector is opening ?
If it is a vortec engine, is fuel pressure at least 65psi ?

Posted on Apr 09, 2015

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Posted on Jan 02, 2017

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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

clifford224
  • 1975 Answers

SOURCE: my 99 windstar ran out

To start with, stop using the spray because this is not good for a fuel injected vehicle and you can cause damage to the valves if you continue to do so. Carbs were different in the old days. OK, you may have just caused the fuel pump to try and work a little harder due to being out of gas. There is a fuel cut off switch that will "pop" if you are in an accident or there is an electrical overload. that switch is located in the cargo area od the vehicle. below is a picture of its location for you and the button is on top. Just push it in. If it is "pooped" you will be able to tell for sure when you push it in. Also you may want to check the fuse for the fuel pump motor itself. that fuse is located in the fuse panel under the hood of the vehicle in the engine compartment. The fuse is located in the number 5 position and should be a 15 amp fuse (diagram of fuse layout below). And last is to check the fuel pump relay as well. the relay is located in that same fuse panel and is in the number 207 position. You can check if it is engaging by putting your finger on it and having someone tur the key just to the "on"position (no need to turn the vehicle over as it will engage for 3 - 5 seconds when the key is turned on). You will feel it "click" if it does with your finger. One other thing is if any of these are the problem, you should first prime the fuel system before trying to start the vehicle. this is done by again turning the vehicle key to the "on" position only, wait for 3 - 5 seconds then to the off positiom, turn the key back to the "on" position agian for the same amount of time. Do this several times so the fuel system will build back pressure before trying to start the vehicle. OK, I'm done. I hope this helps and you get going again. Good luck.


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Posted on Jun 08, 2011

GM Elec
  • 1000 Answers

SOURCE: 99 GMC sonoma will start with starting fluid then

Will the engine start on its own after the engine is warmed up?
Let me know.
Regards,

Posted on Mar 23, 2009

redbeard00
  • 957 Answers

SOURCE: 99 GMC sonoma will start with starting fluid then

The 99 GMC, when it acts up, check whether it has fuel and/or spark. It could be related to fuel pressure, available electrical power, ignition component/s.

Posted on Jun 01, 2009

  • 10 Answers

SOURCE: I have a 99 gmc sierra with 5.3 it takes about 7 seconds to start

Needs a valve adjustment. I assume its EFI, eliminating the possibility of the carb.

Posted on Sep 04, 2009

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99 GMC sonoma will start with starting fluid then


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