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It's in the engine bay somewhere. Here are the 5 wire colors to it: 1) tan & white, 2) orange, 3) black & white, 4) dark green & white, 5) red.
The surest way to test the fuel pump is to hook up a voltmeter or test light on the pump wire at the fuel tank connector-on the harness side, not the tank side. Then see if the pump wire has power with the engine cranking over. If it has power, but won't make the pump work when connected, then most likely your pump is bad. Turning the key to ON will also make the pump come on for 2 seconds (to prime the system), but it is easy to miss that signal, so check for power with the engine cranking.
Look around in the engine compartment, and up around the firewall on driver's side. Look for a red wire with I think a green connector on it. This wire will not be connected to anything. It is the pump prime, for test purposes. If you put 12 volts battery juice into the connector, it should make your fuel pump come on.
Usually on these it is the fuel pump sending unit. But here is how the wires connect. Here is what you need to do about the different wire colors. First disconnect your negative battery. Drop the fuel tank and replace pump. Remember to have a splice kit in hand. Ok now here is how you connect the different colored wires. Black goes with black. Gray goes with black and orange wire. Purple goes wit blue and yellow. And the last wires goes together. I hope this helps.
The gray wire goes from the pump relay to the pump. The black white wire is the ground for the pump. The purple is for the gauge on the dash and the black is ground for the sending unit. I don't list a white wire being used. If the colors on the truck don't match the tank, you'll have to test them to verify each circuit.
Here is what I have from my diagram - - the wire from the fuel gauge on the dash to the sending unit in the tank is purple. Not the pump. The wire from the pump to the pump relay is gray. The wire from the relay to the 10amp fuse is purple. The wire from the relay to the computer is orange. The wire from the relay used to power the pump to prime it is red. And the ground wire for the relay is black-white.
Can you hear the fuel pump buzz for about 2 seconds after the key is first turned ON?
If yes, possible plugged filter or weak pump.
If no, locate the fuel pump relay near the brake booster. Should have an orange, tan/white, red, dark green/white and black/white wires. Unplug it and jumper the orange and tan/white wires for a second or two. Does the fule pump run now? If not, bad pump.
If it does run then it could be a bad relay or circuit.
Constant 12v+ Wire: Green/Violet Switched 12v+ Wire: Yellow/Black
Ground Wire: Black/Light Green Illumination Wire: Light Blue/Red Antenna Trigger: Orange/Blue Amp Trigger Wire: Blue (If Equipped) Left Front Speaker Positive Wire (+): Orange/Light Green Left Front Speaker Negative Wire (-): Light Blue/White Right Front Speaker Positive Wire (+): White/Light Green Right Front Speaker Negative Wire (-): Dark Green/Orange Left Rear Speaker Positive Wire (+): Gray/Light Blue Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red Right Rear Speaker Negative Wire (-): Brown/Pink
My schematic lies to me a lot but here it is: dark blue:goes to gauge, dark green with red stripe is pump power and black is ground. Hot wire should have 12v, dark blue should have pulsing voltage and black should be absolute ground.