LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Fuel Pump Problems? - I swear it never ends

Old 04-03-2010, 10:14 PM
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Fuel Pump Problems? - I swear it never ends

So I got the clutch back in (after many, many problems) and I went to start the car and it seemed like it was out of gas. So I put 5 gallons of gas into it and tried to start it up. I turned the key and I could hear the fuel pump priming.

I then started the car and it started for a few seconds then it turned off. I tried to start it again and it just would not start. After looking things over, we realized it wasn't getting fuel anymore. Also, when you turn the key, you can no longer hear the pump priming.

We tested the fuel pump connector and it doesn't seem to be getting any power. Is the fuel pump toast or is the wiring/electronics acting up somewhere?
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Old 04-03-2010, 11:06 PM
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are u getting a security light? check the fuse, the relay. on the relay c1 goes to the pass key decoder/ignition. could be vats.
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Old 04-04-2010, 12:32 AM
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There isn't supposed to be power at the fuel pump prime connector. It's purpose is to run the pump by jumping a 12v source TO the connector.
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Old 04-04-2010, 08:15 PM
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When I was testing the relay (a new relay) the pink wire seems to be getting power constantly - which it should be. The green wire, which gets hot when the key is turned, is only getting power for a few seconds then turning off.

Is this because the fuel pump is bad or because the PCM is turning it off?

Last edited by Counted Out; 04-04-2010 at 08:53 PM.
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Old 04-05-2010, 12:43 AM
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if the motor is not running/turning over the ecm only turns the pump on for 2 to 3 seconds. is the pump coming on for the 2 to 3 seconds? is there power going to the grey wire, it goes to the pump.
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