Quote:
Originally Posted by starfishkiller
I went out and jumpered the front fuel pump, and also jumpered the front fuel sender. As expected the gauge read nearly full for the front tank. I then jumpered the rear fuel pump, and rear fuel sender. The gauge read around quarter tank.
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Where exactly did you do this jumpering to & from? If you did it AT the switch connector, then you missed the point of the test. You need to bypass all the truck's wiring from the tanks to the switch connector.
Quote:
Originally Posted by starfishkiller
I have been running the truck with the tank selector switch set for the front tank. The fuel gage needle does not come down off of full.
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Quote:
Originally Posted by starfishkiller
I then drove the truck to a gas station, and pumped $20.00 worth of gas in the rear tank. It took it all and that pushed the gas gauge up to three quarter tank. I tried to put some gas in the front tank, but it wouldn't take it. So, I think the gauge is measuring the amount of fuel in each tank correctly.
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Not from what I'm reading here. You drove on the front tank, but the fuel came from the rear tank.
Something is crossed between the tanks & the switch.
Quote:
Originally Posted by starfishkiller
Is there a way for the running pump to receive fuel from the other tank?
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No.
Quote:
Originally Posted by starfishkiller
Is there some failure mode that would cause my symptoms?
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I can't imagine any. I think it has to be incorrect reassembly, but I can't pinpoint where from what you're posting.
If you're absolutely certain you've tested the level sender circuits correctly, then I'd set the switch & run one tank dry to find out what's happening.
