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If the sub tank gauge still reads full with both the plugs disconnected you more then likely have a short to ground in the wire between the gauge and the sub tank.

Start by following the harness...

First thing you need to do is test that your transfer pump is working.

There are two places you can do this

1. At the control module located below the radio (this would be the easiest place to...

That's up to you.........if your transfer pump is not faulty, all you would need to do is mount an on/off switch in the dash, wire up a relay to run the transfer pump and then remember to turn it off...

I don't think it will be a fuse.

Do both fuel gauges work correctly? this is very important.

Have you installed long range tanks?

When it "sometimes works" can you see the fuel being...

Yendor is your man he wont be too far away