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Old 05-13-2013, 08:06 PM   #1
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Fuel Pump Bad? Fuel relay clicking

I had check engine light come on. Has been driving great before that. Immediately began to run extremely rough, couldn't accelerate, 30mph top speed. At autozone it threw 11 codes:
P0031 P0051 P0136 P0300 P0302 P0304 P0305 P0443 P0743 P1389 P1495
Related to misfire, O2 sensor, Torque converter mainly

However when examining the engine the fuel pump relay is clicking loudly, switched out with another relay, it wasn't clicking until I drove 100 yards then it was also clicking. It seemed to fix the problem for the first 30 yards.

Guys there said it would mean my fuel pump is bad. I can fix things if I know what is wrong (patience & computer tutorials), however am not really any good at diagnosing problems. Don't want to go to that much work only to find out that is not the problem.
Any thoughts or advice.

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Old 05-14-2013, 09:08 AM   #2
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If in doubt when it comes to your fuel pump, put a gauge on it, if it registers between 45-54 psi, it's fine, below it's the pump, above, its the fuel regulator.
as far as the clicking..... check your spark system. make sure you don't have anything shorted in the ignition, battery wire touching the frame....
if you keep blowing the relay, something is causing it. <but what>

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Old 05-14-2013, 10:05 AM   #3
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Those Autozone guys were simply being their usual clueless selves when they said a bad fuel pump would cause the relay to start clicking. That's like saying your fuel ran out because your engine stopped or the tire blew out because it ran out of air.

The fuel pump relay is controlled by the computer, not the fuel pump. The computer isn't happy with something like a sensor which is causing it to shut the fuel pump relay down when it isn't happy, & then re-enable the fuel pump relay when the problem goes away. The torque converter won't have anything to do with the misfires either.

Misfires can be caused by any number of things including a bad 02 sensor, crankshaft position sensor, bad plugs, bad ignition rail, etc.
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