1990 Ford E150 1/2 ton Club Wagon [5.0 EFI] 110,307 Seems while I am sitting inside the van and listening to the external fuel pump whine it will stop whining and the van will die. This problem is causing stalling while driving; I'll drive anywhere from 1 block to 7 miles and in between that distance it will stall repeatedly requiring me to wait anywhere from 30 seconds to a couple minutes before it starts back up. Sometimes it doesn't happen at all where I can go for days without the problem occurring yet now it's almost a daily. The guy before me had replaced the filter and external pump because it was cutting off on him. That didn't solve the problem. I replaced quite a few things such as the tp and egr position sensors, eec and fuel pump relays, IAC valve and recently the ignition coil but the problem persist. Now I am leaning towards so sort of electrical problem resulting in the external pump cutting off (stop making a whining noise) right before the engine dies. What I would like is maybe an explanation of the fuel delivery system's electrical components and perhaps troubleshooting methods. I have dual tanks and have a new inertia switch as well as a tank switch laying around in the event it is the inertia switch. I even have an internal fuel pump (do both tanks have fuel pumps?) Thanks