Fuel pump wiring diagrams9/16/2023 The most common colors are solid black, black with an orange stripe, and green with a blue stripe. Both the ground and the positive fuel level sender wires are thinner or smaller gauges than the fuel pump wires, something we already mentioned.įurthermore, the ground wire will also be darker than the positive wire making it easier to differentiate even without knowing the exact colors. While the fuel level sender doesn’t have anything to do with the fuel pump, its wires are a part of the same connector. The fuel level sender is what controls the fuel gauge in the instrument cluster as well as the low fuel warning light. Although the fuel level sender ground wire is black, it will often have a white or orange stripe, so you don’t have to differentiate them by wire gauge. Then, note which of the two thicker wires is darker, and that’s the fuel pump ground, and the lighter wire is the fuel pump positive. To simplify, figure out which wires are thicker, and those will be the fuel pump wires. Meaning the positive and ground fuel pump wires are thicker than the fuel level sender wires. But whatever the case, the ground wire will almost always be darker than the positive wire, and it’s the same gauge as the positive. In most cases, the ground is solid black or black with a white stripe. The fuel pump ground wire is just that, a ground strap from the fuel pump to the chassis. In other cases, it can be pink (most often found on Fords), orange, and other light colors with or without a stripe. The wire color, in most cases, is light grey – that’s the color of virtually all GM and Ford vehicles. If the wire isn’t black and is thicker than two of the remaining three wires, it’s the fuel pump positive. That way, you can immediately tell it apart. 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 wires. The fuel pump’s positive 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. The fuel level reference (positive) wire can be purple, yellow, orange, and a slew of other colors. The fuel pump ground wire, in most cases, is solid black, and the same goes for the fuel level sender ground. The power supply to the fuel pump is most often light grey or other light colors such as yellow or bright pink. The fuel pump wires’ color codes are as follows. But before we go into more detail, here is everything you should know for now. However, there are some alternative ways you can recognize the wires without knowing the exact color, and you can also probe them with a multimeter to see which wire does what. Instead, the wire colors differ between brands, model years, and even models. Whenever it comes to any kind of automotive wiring and color codes, there is hardly ever a universal standard.
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