You amy have a bad ignition switch. (switch itself, not the key), it is located on the steering column, and is relatively easy/cheap to repair. About 15.00. Mine was doing the same thing unttil I replaced it.
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I guess my first question would be when was fuel filter changed last? Fuel pressure tested? With an 89 it may be wise to take it for a scan (EEC IV) on that year I believe. Try filter first, then fuel pressure test if that doesn't help, then scan. To start replacing sensors without any codes to tell you where to focus your attention, could cost you more in the long run. It shouldn't cost much for a quick scan for trouble codes. let us know.
from the ignition switch or the starter, power is taken fromeither of these points to fire the fuel pump on start. This is what charges the fuel system so that you can start. then your fuel pump goes into run mode.
If someone can make a power check on the wiring going to the fuel pump with the engine is being cranked, you can possibly solve your problem.