20+ Fuel Pump Wires Color Codes. The first thing you should note here is that the fuel pump positive wire is rarely black, and it’s a thicker gauge than the fuel level sender unit. Fuel pump wires can be blue, yellow, green, pink, red, white, orange, and black, to name a few.

The fuel pump’spositive wire comes from the fuel pump relay, goes through the inertia switch, and ends up on the fuel pump, powering it only when you turn the ignition on. Fuel pump wires can be blue, yellow, green, pink, red, white, orange, and black, to name a few. The first thing you should note here is that the fuel pump positive wire is rarely black, and it’s a thicker gauge than the fuel level sender unit.








