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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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