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Should be four ! 1 gray B+ power supply , 2 PPL - purple fuel level signal wire to the PCM - engine computer , 3 Black - ground for fuel pump motor . 4 Black with white trace - ground for fuel level sensor !
Go under the truck and pull the connector at the pump, why is this best way, why do it that way?? Well by going to the pump connector you are making sure the fuel pump wiring is good all the way to the pump without any break in the line from the fuel pump relay. Keep in mind the pump is only powered up while the engine is being started and of course running, so it is best that you jump the relay socket so the pump is always powered up. Most relays have a diagram on them showing which terminals are power in and power out.
fuel pump relay: on relay center,behind glove box, 2nd column of relays, 2nd one from the top.
fuse: the wiring diagram says that it is fuse #6 on/by?? the relay center.
there should be a fuel pump test connector taped to the harness by/behind the battery. probably single red wire with a black or white connector. apply 12 volts to connector to test fuel pump.
Just did my fuel pump on the 2001 isuzu rodeo. Well 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.
Grey is the power to the fuel pump.
Purple is the power to the fuel level sensor.
One black wire should go to the frame (fuel pump ground).
The other black wire should go to a connector and back to the fuel guage.