There is no "Pressure" switch. Fuel pressure sensors didn't come about until the returnless fuel system was developed. Fords do have an inertia switch that is a safety shut off in case the pump relay were to stick closed and a fuel line were severed in an accident. It takes a significant bump from another vehicle to cause it to open. Since the pump runs even when the truck won't start, that isn't your problem. One problem they did have back then on dual tank vehicles, and there was a recall (93S68) for it, was they would transfer fuel between the fuel tanks. The fix was install a check valve on each fuel pump in each tank and a new fuel pressure regulator. When the truck won't start, check for battery voltage on the coil primary feed from the ignition switch. Fords with EEC4 are the worlds easiest vehicles to hotwire. Run a wire from the battery to the coil positive and it will power up the ignition and engine control. I'm thinking you will find either a PCM problem, or a wiring issue. The fuel pump relay is controlled by the PCM, not at all by the ignition switch. The only time the relay will engage is during cranking, or when the PCM sees a tach signal (engine running). Look closely at the PCM relay and fuel pump relays. They are on the fender next to the starter relay. An O.E. fuel pump relay will be green. Look the wires over closely for shorts to power since the supply for the fuel pump and PCM are live at all times. Fords of that era have very durable and dependable PCM's, so check the wiring first.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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