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I have a 1985 Chevy Scottsdale, dual tanks from factory (NL2 option). I have replaced the mechanical fuel pump with in tank electric fuel pumps for EFI conversion. Each fuel pump is being powered by it's separate relay, this provides +12v to each of the fuel pumps when the selector switch is used. ON the selector switch I have tapped the LT.Grn and Drk.Grn wires to provide the volts to energize the relays for the fuel pumps. This seems to be working correctly. The fuel gauge reads completely empty when the left tank is selected and overfull when the right tank is selected. I have checked the grounds from the original fuel pickups to frame and the grounds check good. The selector switch is the constant on rocker type, not the depress fully momentary type. I have noticed that the engine stalls when switching tanks while running, but starts and runs on either tank if not switched after initial startup. Does anyone have a suggestion on the fuel gauge issue? So, I looked in the left tank and it is empty, apparently the gauge was correct. I had originally put 10 gallons in each tank. The left tank is now empty, the gauge says the right tank is overfull. I will try to look in right tank later. I am thinking that maybe the fuel from the left tank maybe returning to the right tank.