I connected the battery after about two months of being diconnected. (I drove the car to the exact spot where it sits today, so I know it worked before.) All the wiring is connected, and everything works EXCEPT the fuel pump and the blower motor. Is there a common fuse? I have only tried to turn the key to "ON" so that I could double check which line was feed and which was return. (Making custom lines.) There was nothing - usually you can hear the pump pressurize. Is there a fuel safety switch? Any recommendations on how to trouble shoot would be greatly appreciated.



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[This message has been edited by Mike 25th (edited October 03, 2000).]

 

Common guys - I need help...

 

Mike,

There are a couple of problems with your method. When you first turn on the ignition, the ECM will power the fuel pump relay for about two seconds. This is generally long enough to pressurize the fuel rails. After that, the pump will not be energized again until the engine is started. Turning off the ignition doesn;t "reset" the cycle immediately. There is a time lapse required before the ECM will energize the pump relay again.



There is also a fuse for the fuel pump, located in a holder near the battery. The blower is connected through a fuse for the lower three speeds and a circuit breaker on the highest speed. It is basically unrelated to the fuel pump except for the common positive connection to the battery.



I would check the fuel pump fuse first, then the relay. Make sure the relay gets energized for a couple of seconds when you first turn on the ignition.

You can test the pump directly by applying a 12VDC supply to the 'G' terminal on the ALDL connector. Do this only when the ingition is turned off and only long enough to test pump operation. This will bypass both the ECM and the relay, powering the fuel pump directly.



If the pump does not operate with power directly applied, you need to check the electrical connector at the top of the fuel tank for both power and a reliable ground connection. Failing that, the pump may need replacement.

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Later,
Vader
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I've checked all fuses inside and out of the car. I will be testing the relay tonight. Is it possible that the relay isn't getting the proper voltage and will not engage? But why doesn't the blower motor work. All I did was change the intake manifold, add headers and new valve covers...

Arrrrrrgh!!!!