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David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.
Digital gauge also gets its input for fuel level from a float in the tank. Here the culprit can be that float because the error is systematic i.e., full on empty and empty on full/half. If the reading was erratic then it was something to do with IC in the bars display panel.
hi this sounds like it could be a couple of things, first the obvious have you checked the fuse? or it might be the relay in the fuse box might need replacing, and the fuel sender unit in the fuel tank, you also can check out the wires going to the sender unit, sometimes you can find these under the rear seat or in the boot/trunk area might be a simple case of one of the wires have come adrift there is a couple of things to check before having the sender unit replaced or the Gage..hope that helps
the gas is regulated from the switching valve you control off the dash. Check the valve to hear it switch
have a friend help you do this. it will be located under the truck between the two tanks. You may have a faultly valve or switch rattling inside changing the tanks setting also while driving which will be hard to tell
It sounds as if you have a problem in the switcher valve. Make sure front tank is full! There is a problem with the way these are origionally set up. I have seen where the guages showed full but were empty. If the valve is damaged it coould have been using the front tank with the rear also, although it is not supposed to happen it did on this particular truck.You may also want to check and make sure the fuel is clean in that tank.