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Check for black smoke out of the tail-pipe when the engine is revved. Black smoke means unburned fuel. The most likely culprit is a plugged air filter/air intake. A plugged exhaust, especially the catalytic convertor will kill your fuel economy and power. It may also be in need of a good tune-up (spark plugs, filters, ignition wires, distributor cap/rotor). Also check tire pressures and make sure that you don't have any seized brakes.
Up until 1989, EFI fuel systems in the F250 actually used two fuel pumps; a low-pressure pump in the tank and a high-pressure pump mounted on the frame.High Pressure Pump
The part on the fuel rail you are referring to is most likely the fuel pressure regulator, which, if bad can also cause fuel delivery problems. From 1990 and up, the two pump system was replaced with a single, in-tank pump.Hope this info helps you out!
Carburated engines is on the drivers side of the engine in the front Fuel injected are in the Tank and some high pressue system had an additional "pusher pump" on the frame rail
High Pressure Pump
Hope this info helps you out!
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