Question about 1998 Chevrolet C1500

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Will not start

Died while running in driveway. Turn the key on can hear the relay, the fuel pump turns on a couple of seconds, will not fire. gave it a shot of either it fired. checked fuel presure , It was only 31 psi, blocked the return line, still only 31 psi. cked the lines and fuel filter their ok too.seems to be power to the injectors and the ohms across injectors is ok. fuses look good too. I'm thinking fuel pump? my truck wont start neather but the only difference is I also dont hear the relay when I open up the key ingnision can it be the fuel pump? GM repaced it 8 years ago at about 40k-50k miles. Now it has 141K miles.

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  • esamsx45 Jan 26, 2009

    same poblem. hard to start when cold. once started the first time and warmed up starts every time. on warm days starts every time with no problem.

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Its the fuel pump that pressure is way to low please rate -jeff

Posted on Sep 01, 2008

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If you can hear the fuel pump then most likely the ASD relay and fuel pump circuit is working properly. If all it does is back fire w starting fluid something else is going on. Get a inexpensive code reader. Or turn the key 3 times quickly from off to accessory finishing on accessory and look at the odometer it should give you a code. Sounds like a timing issue or CKP, CMP coalition issue.

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Generally speaking, its supposed to do that.
The fuel pump(s) is powered by a relay that turns on for 3 seconds when you turn the key on. If the engine does not start and produce oil pressure, thats all the power the pump gets. If you were in a wreck the pump would shut off when the engine dies even with the key on to prevent a fire.
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When you state "carb" I assume you mean TB as it should be Throttle Body Injection, unless it was converted.
You should be able to hear the fuel pump in the tank prime for about 2 seconds when you first turn the key on. May have to get your helper to remove the gas cap and listen through the filler.
If you don't hear a buzzing sound then check the relays on the firewall. You can turn the key off, wait a couple seconds and then turn the key on and have your helper listen and feel for the relay that clicks.
Or look for the wires,
The relay will have a dark green/white from the ECM
Grey is power to the pump when the relay is enegized.
Orange is hot at all times. It comes from the ECM B fuse. Should check that as well if not done so.
Black/white is a ground.

Now most likely if your relay clicks when the key is turned on then its all fine and the fuel pump has gone out. The oil pressure switch also enegizes the pump when there is oil pressure.

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do you hear the fuel pump turn on when you turn the key to the run position? If not the check the fuel pump relay.

If the car will start and run for a few seconds then die, It may well be the crank position sensor.

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1 Answer

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Jun 11, 2008 | 1998 Chevrolet C1500

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