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Oops! The above diagram is for pre-TBI tank wiring. The selector switch also powers the respective in-tank pumps on TBI equipped vehicles. Connections are nearly the same with the exception that the dark green and light green (tan and gray on TBI equipped vehicles) selector valve motor wiring extends to the pumps too....
Thanks, I am lost when it comes to wiring. Not having a switch and the truck is running on whatever tank is normal?
Are you saying the tan and gry/blk come directly from the left tank pickup unit? Post a pic. Usually, tan connects to the left side in-tank pump motor and gray connects to the right in-tank pump motor.
Unless the factory switch has been unplugged or repurposed, it is connected through four wires to 12-volt power via the fuel pump relay (tan/wht), ground (blk), both in-tank pumps and the fuel selector valve (tan - left tank & selector valve, and gray - right tank & selector valve). The dash switch controls directly which pump receives power, as well as, motoring the tank selector valve located under the cab between the left and right tanks. The tank selector valve switched the dash gauge between the two tanks. In effect, if you plan on abandoning future reinstallation of dual tanks and running the truck only off the left side, you need to see 12-volt ignition power on the tan wire running to the left in-tank pump and splice the solid pink wire that once-upon-a-time connected the instrument cluster fuel gauge to the selector valve directly to the pnk/blk wire running to the left fuel tank sender. Am I making sense?
I just looked at the wiring again above. Should the tan 920 and tan/white 120 be connected since the switch is no longer in play?