I have an 04 Ford Explorer XLT 4.0 Flex Fuel. There has been loss of power to fuel pump. Relay and fuse both good, replaced the inertia switch...still nothing. Could a FPDM (fuel pump driver module) have anything to do with this issue? Or what should I check next? Any advice would be most appreciated... I am definitely at a loss as to what the issue could be!
I know it is fuel related because I used starting fluid and it started right up and run for just a few seconds, so that should rule out ignition I think.

 

Did you confirm that you do not have power to the fuel pump, or just know that it's not getting fuel to the cylinders to burn because it will start and run with starting fluid?

If you've checked for voltage at the fuel pump and it's not there, then simply walk back toward the battery checking for power. Do you have power to the inertia switch? Do you have power to and through the fuse? And so forth.

-Rod

 

I have confirmed that there is no power to fuel pump. There is power to the inertia switch, and from my understanding from there the power goes to the FPDM (fuel pump driver module) which is located inside the passenger compartment behind the rear trim panel on the right hand side. I am trying to find out if the FPDM can stop power from going to the fuel pump. Not quite sure what function the FDPM plays in the returnless fuel system. I have been doing some research, but haven't found out much.

~lamm

 

Yep, power comes from Fuse F1.26 (20A) in the Battery Junction Box through the fuel pump relay to the Inertia Switch. When closed, the power then travels to the Fuel Pump Driver Module (FPDM) which provides power and ground to the Fuel Pump. The PCM provides signals FP and FPM to the FPDM. So if you have power through the inertia switch but not to the fuel pump, it's logical to check the signals to the FPDM and for continuity between the FPDM and the fuel pump.

I'm not sure which sensor inputs are used by the PCM to control the FPDM though, but you might want to check things like the Crankshaft Position Sensor to make sure it's providing a good signal to the PCM before condemning the more expensive FPDM.

-Rod