Intermittent no start/fuel pump control module

I have a 2000 taurus, flex fuel, and it has an intermittent no start problem. After putting a computer on it, I believe the code it threw was 1233, which said something about a fuel pump control module. I went through several tests, checked the intertia switch, etc, but nothing seemed to check out. The fuel gauge doesn't work on this fine piece either. After doing a little research, I found that this car has been to the dealership several times, with no results, any ideas?

Code P1233 is "Fuel System disabled or offline." Would you be able to verify the exact code that was displayed? For code 1233 the description is:

"The PCM monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). With the key on, the FPDM continuously sends a duty cycle signal to the PCM through the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal."

Possible causes are:
-Inertia fuel shutoff (IFS) switch needs to be reset
-Open FPDM ground circuit
-Open or shorted FPM circuit
-Damaged IFS switch
-Damaged FPDM
-Damaged PCM

If you have access to an oscilloscope, the following might be of use:
"The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: 1) 50% (500 msec on, 500 msec off), all OK. 2) 25% (250 msec on, 750 msec off), FPDM did not receive a fuel pump (FP) duty cycle command from the PCM, or the duty cycle that was received was invalid. 3) 75% (750 msec ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump."

-Rod