Perhaps check out the links below will help. Good luck:
Haynes manuals
SOURCE: fuel pump location and replacement
You are looking for the constant control relay module- ( CCRM ) see below. The pump will be located inside the fuel tank.Most of the time , its the pump and not the relay but, it wouldn't hurt to check the relay out. Teh relay is housed in the CCRM. Its located behind the engine coolant reservoir. 
SOURCE: 1990 Ford F-150 Fuel Pump
yes, fuel pump is inside the tank, replace filter first. then i would test the fuel pressure at the rail, 30 -45 psi at idle. also test pressure regulator. replace pump last (its expensive)
SOURCE: 1989 ford f150 loss of power
1989 is fuel injected, on the intake there is idle air control valve, make sure this is not dirty, also you may want to check the coolant temperature sensor, if the engine thinks it is warmer then waht it is the fuel air ratio will be off and your truck will run bad.
SOURCE: I have a 1987 F350
take the shut off valve out of the injector pump and inside the valve is a round metal body with a rubber seal on the end ,check this seal hasnt swollen and stuck ,also check inside the primary fuel filter for any transparant pieces or crystal ,this is a problem i have been getting of late with people putting this bio fuel into the tank ,it causes this crystal stuff and it damages the injector pump as it passes through the filters and solidifies in the injector pump and kills them.just though before you start pulling it apart crack off a couple of injector pipes and get assistant to crank engine throttle wide open and see if its pumping fuel first this will give you some idea what to look for ,leave this answer in your e mail box so you can get back to me later after having a look ,but please remember the time zone difference
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