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Re: no power to in tank pump 200

posted by  someone claiming to be Brian on  Wed Nov 15 13:15 CST 2000 [RELATED]

James,

You didn't mention what year your brick is, so I'll tell how a '90 works just in case it's close.

Both pumps are driven together by the same relay. Well, actually, it is a pair of relays inside the same cover, one of which is for the pumps.

All that aside, the main pump is driven directly by the relay, protected only by the 25A fuse under the hood by the battery.

The tank pump feed, however, passes through a second fuse, this time an 8A. The logic here is that a fault in the tank pump will blow the 8A and won't K.O. the 25A fuse; this means you can still boot around in your brick, laughing in the face of danger the whole way.

Hopefully the crude "diagram" below will help explain this.

25A Rly 8A

[BAT]---|~|----/----------|~|---(tank pump)

\___________(main pump)

So, if the main pump is working (you didn't say, but since this isn't another "car dead" posting I'll assume it's working), I would look at fuse #4 and the wiring from there to the tank pump.

Another tip: the same fuse that powers the tank pump also feeds the 02 sensor. Check the yellow w/red striped wire on the 02 sensor connector with the engine running. If it has +BAT the fuse is okay.

And based on other postings I've read here, it might be a good idea to keep the tank topped up. Otherwise the fuel will drain back and the main pump will probably have a harder time getting primed back up.

Enjoy.





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