The Powertrain control module and inputs to the powertrain control module will determine how fast the fuel pump driver module will run. Ford uses a pulse width modulated Fuel Pump Driver Module (FPDM or fuel pump control unit) to control the fuel pump speed. On these vehicles, the fuel system is a bit different. Click here to chat live with a Ford Mechanic. But first, I will explain how the fuel pump operates. From there, I can pull codes and read live data using my scanner. Next step was to plug into the 16 pin OBD2 diagnostic connector located under the dash. I was quickly able to confirm the engine has spark by verifying that the check engine light goes off while cranking the engine over and also by using my spark tester installed into the ignition coil. There was a diagnostic trouble code of P0191 and P1233. Upon checking, the truck had spark but no fuel pressure when cranking. Customer stated they were in the middle of a car wash and the engine stalled out and would not restart. Recently, we had a 2004 ford f150 with a 5.4-liter engine towed into the shop.
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