Question about 1994 Chevrolet Suburban

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I can manually turn the fuel pump on but it does not turn on when i turn the key on but if i try to start it with the fuel pump manually turned on i still get no fuel out of the injectors

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2 Answers

Your turning the pump on-- jumping the relay
or whatever

If you got no injector pulse or spark,then no fuel out,
as you say

Check for pressure at motor with a gauge & spark or
injector pulse while cranking.

Posted on Dec 06, 2012

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Have you jumped the fuel pump relay socket to see if it turns on?

Posted on Dec 06, 2012

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Posted on Jan 02, 2017

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I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
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Model? Year?

Check per owner manual to be sure inertia switch is not tripped. Remember, fuel pump only runs for 5 seconds when key is turned ON, then it shuts off if engine is not running. Pump always runs when key is in START position.
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If it is similar to Quest, the fuel pump runs for 5 seconds when you turn the key to ON. Then, unless the engine is running, the pump shuts off. It runs when the key is in START position though. Can you hear the pump run for 5 seconds when you turn key to ON? Listen carefully for the hum of the pump in the tank.
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I would check fuel pressure so you can rule out pump. I had a bad pump right out of the box before. Also you may want to change fuel filter so you can rule out plugged filter. You have spark, sure seems like still no fuel.

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