1978 Chev C-10 Pick-up Malfunction - Electrical & Lighting Systems

Question: 1978 CHEV C-10 PICKUP WHEN BOTH GAS TANKS ARE FULL AND I SELECT THE LEFT GAS TANK FOR INSTANCE THE GAUGE CONTINUES TO READ FULL THEN WHEN I SWITCH TO THE RIGHT TANK THE GUAGE SHOWS A DROP IN THE FUEL LEVEL I HAVE LOOKED AT THE WIRING PLUG TO THE TANK SELECTOR SWITCH AND IT IS PLUGED IN PROPERLY? CAN YOU HELP ME SOLVE THIS PROBLEM THANK YOU DON.

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Technican: Don, there is a sliding mili-volt controller in the gas tank. To correct the problem will require dropping the fuel tank and adjusting the float on the sending unit. If for some reason the float will not adjust (normally due to age) you will have to replace the sending unit (cost is normally about 100.00.. for the conveince of making sure the tank is full (vice empty) I would not worry about the work. Let me know if I can be more help.
Owner: the gauge reads correctly on both tanks but when the switch is on the left tank it reads the right tank when the switch is on the right tank it reads the left tank? still need more info thank you don.
Technican: ooo i mis understood you initial question.. try to flip the wires on the tank switch and see what happens..
Owner: do you mean the switch on the dash or at the tanks the dash switch will only fit on the connectors one way this i have already looked at there are three slots one one side of the switch and two on the other side ? i do not know how long it has been like this i just purchaced the truck. need more info thank you don.
Technican: No i meant at the tanks.. I do not believe that you can switch the wires at the dash with out some problems.. the fuel pumps will not care what the alignment of the wiring is.. they just need juice to run. Al

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