Question about 1990 GMC Sierra

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No fuel at start up

Truck starts and runs fine after I give it a shot of starting fluid but not getting fuel when I turn the ignition and wont start

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  • Anonymous Mar 30, 2014

    engine turns over , but wont start . have a lot of fuel but not starting

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I would do a fuel pressure test. should be around 50 P.S.I. 3 to 4 P.S.I. lower from that could mean pump is weak and most likely ready to quit altogether. also when was the last time its had a fuel filter. if its been a while chg. it and then see how it starts.

Posted on Jan 21, 2009

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1 Answer

My gmc 4.3 stalls when warm and wont start without ether. then it runs fine


I had the exact problem with my 1993 chevy c1500. I found that the IAC was sticking so the engine would die at idle after warming up and the ignition module was pulsing the ECM intermittently after the engine warmed up so the fuel pump wasn't being turned on after the engine died....I replaced the ignition module and the IAC valve and all is good. I don't know if testing the ignition module reveals that it isn't sending pulses to the ECM.

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Does it have spark at the spark plugs. If it has spark is it getting gas. Try spraying a little starting fluid in it, does it try to start? Then it isn't getting fuel. Is the fuel pump running when the ignition is first turned on? Fuel pump relay, fuse, fuel pump itself. Just telling you some things to check so people can give a better informed answer.

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Ran fine last night drove round trip prob 75 miles no prob parked tried to start in morming keepd cranking wont start less than 1/4 tqnk off gas banged on gas tank while cranking still wont start any...


One way to check the fuel pump is to turn the ignition to on and listen for the pump to run. It should run for a few seconds. It may be a couple of seconds after you turn the ignition to on before it runs. Normally you can do this repeated times.

If you don't hear the pump run that is most probably the problem.

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Car wont start. it turns over but doesn't start


One of two thngs, assuming you have compression in the cylinders....no spark or no fuel. Try a shot of starting fluid (available at any parts store, or Wal-Mart) in the air intake. If it trys to start on the starting fluid, then you have a fuel problem, if not, you have an ignition problem.

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Check the fuel lines and make sure pressure relief cap is tight. try a new fuel filter.

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Does a fuel pump continue to pump fuel with ignition on when the fuel line is diconected from fuel filter The car wont start no codes found it has done this a few times this year it runs fine when running...


you have a bad fuel pump it's in the tank and only comes on in these conditions.
1. ignition switch turned to the run position turns on for two seconds.
2. same as above but when engine starts pump continues to run as long as engine runs. and the safety switch for blow out prevention has not been tripped.

Your problem is the fuel pump and fuel sock and the check valve in the pump. only one way to be sure and that's pressure testing. You hook up gage to fuel rail turn the ignition key to the run position look at pressure should read 40 to 50 psi and should hold for 1 minute, if you drop 5 pounds in one minute pump is bad and even if it started they could verify that the check valve is not holding pressure.
This is caused by the life of the pump by using gas with ethonal in it and your car was not designed for it, so it damages the pump and injectors and destroys the filter in the pump.

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1 Answer

Car turns over, but will not start. Seems like it is not getting fuel.


Can you hear the fuel pump run? Have you checked for spark yet? You can also give it a little shot of starting fluid to see if it will try to start, don't get carried away with it though, can cause damage if not used properly. If it trys to start with starting fluid, you need a fuel pump. If no spark you will have to start checking the ignition componets.

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It sounds like you aren't getting fuel out of the cold start injector... remove the injector when engine is cold and switch on ignition... you should get a fine spray pattern for a few seconds... if not then there is probably a problem with the cold start circuit (Temp sensor fault), or the injector is faulty. pull electrical connectors one at a time and look for corrosion... Hope this helps...;-)

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