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Shows the 7 wires used at the fuel tank
4 for the pump and fuel level sender
then 3 for the EVAP systems pressure sensor
RonD,
Thank you for taking the time !
I'm still confused about the yellow wire, I tried to trace it out and there doesn't appear to be a separate unit where these wires would go.
Must be just me and reading the schematics.
I will take a little time and run these wires.
Yellow wire is for the sender, should be on the 4 wire connector, but on the truck wiring side, the fuel pump assembly wire can be any color if its 3rd party
Yellow and black are the 2 wires for the sender, 5v pulsed, and black is ground
No reason I know of to tap into them unless some one was going to add a 2nd gas tank, then that's where you could install a switch/relay to check level in 2nd tank and it would show it on the dash gas gauge
The 2nd Tank idea sound solid; I would guess that being the problem, it was probably giving the previous owner trouble, so they removed a relay or something along that lines.
Never thought of the two tank theory.