I have a 2004 F150 5.4L 3v SCAB 4x4 that I drive Daily, it has 280,000 miles on it. While driving to work (70mph) my throttle became unresponsive and it felt like the transmission was downshifting. Made my way to the edge of the highway and placed truck into Neutral, then the engine quit. Tried restarting at which point would not fire. After letting the truck sit (while waiting for a tow) I decided to try to start it. The Truck did start and ran for only about 2 minutes and then quit. The Tow truck finally arrived and I tried to start again with the same problem occurring, stated and ran for about 2 minutes (no throttle response) and died. Got the truck home and decided to remove the Fuel line from the filter to see if there was fuel flowing, which there was none and no pressure. Replaced the FPDM with a new one, old unit was corroded but not cracked (replaced it once before). Tried to start and would only crank with out any fuel flowing (still had it removed from the filter). Thinking it may be the Fuel Pump but have to drain the tank being that I just filled it this morning before it died. The problem is, how to drain the tank before lowering it if the Fuel Pump is not running??? Any Ideas as to what the Problem is or how to test Fuel Pump or drain the Tank?