here you go...
i really hope this helps. keep us posted
1. Check the circuits of the Fuel Pump Driver Module (FPDM) to narrow down the cause of the problem. The FPDM is located at the rear of the vehicle on the frame rail on the driver's side of the vehicle, behind the rear axle.
2. The White wire at FPDM pin 5 should show battery voltage whenever the ignition key is on, from the fuel pump relay, through the inertia switch.
3. The Black/Orange wire at FPDM pin 3 is a dedicated ground for the FPDM, grounding to the frame at G300, near the FPDM.
4. The Pink/Black wire at FPDM pin 4 is power out of the FPDM feeding the fuel pump. This circuit should show battery voltage whenever the key is in the run position.
5. The Light Green/Yellow wire at FPDM pin 2 is the fuel pump ground circuit. This circuit is duty cycled with a ground signal from the FPDM based on the command from the Powertrain Control Module (PCM). Back probing this circuit with a jumper wire and grounding it should result in 70+ PSI of fuel pressure if there is power to the fuel pump and the pump is good.
6. The Brown/Orange wire at FPDM pin 6 is the command signal sent from the PCM to the FPDM. This is a duty-cycled signal, with the PCM supplying a duty-cycle between 5% and 50% when it is commanding the FPDM to run the pump, and a 75% duty-cycle when it is commanding the FPDM to shut the pump off. If the duty-cycle is commanded between 5% and 50%, there should be exactly double that amount of ground to the fuel pump on the Light Green/Yellow wire. For instance, if the duty cycle on the Brown/Orange wire is 20%, this would be a command for the FPDM to supply a 40% ground to the pump, and if the duty cycle on the Brown/Orange wire is 50%, this would be a command for the FPDM to supply a 100% ground to the pump.
7. The Light Blue/Red wire at FPDM pin 1 is a feedback signal sent from the FPDM back to the PCM. This is also a duty cycle signal, with the duty cycled at 50% when everything is OK, and changing to a 25% or 75% duty cycle if the FPDM is seeing a problem.