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Old 06-06-2007, 04:18 PM
mwmoes mwmoes is offline
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Re: 93 bravada - error code 54, fuel pump, fuel relay

MT-2500's troubleshooting tree was most helpful...

I found the fuel pump relay. It was in a bank of two relays mounted on the firewall in the area behind the power steering reservoir. I was able to indentify it by the orange and gray wires. I'm not sure what the other relay was.

I had a operable fuse at ECMB and 12V. I had 12V on the orange wire coming into the relay. I went back to the fuel pump and unplugged it and found 0V on the gray wire. I checked for continuity on the gray wire between the relay and the harness to plug in the fuel pump and it was functioning.

Note that I did not need to crank the engine to determine these voltage.

I then went to the auto parts store to get the relay. Note they did not have anything under "Fuel Pump Relay" in their system so they did a cross reference on the part number on the old relay. $10.95.

Put in relay. Car started!

Note to readers... Check the $10.95 part (1 hr) before spending the $204.50 on the fuel pump and sending unit (6 hrs).

My electrical weakness was exposed in this repair. Lesson learned. Will spend more time troubleshooting next time.

Thanks for your help!

Mike
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