i have a 91 5 speed, 305 tbi. i am getting no fuel to the injection system. i replaced the fuel pump, filter and fuel relay switch. i am getting no power to the pump. any suggestions?

Empty tank.
Blown fuse.
Open power supply wire in harness.
Open ground wire/circuit at fuel pump assembly/tank.
Sunken socket in connector(s).
No power to relay due to broken wire or bad driver in ECM.
Fusible link at starter solenoid stud burnt/broken.

Fuel pump should come ON for two seconds when ign ke is turned to IGN position. After this event, Start signal should energize the relay, via ECM, and, in a parallel path, oil pressure switch should close and provide another path to energize fuel pump. Oil pressure sensor is underneath distributor.

when you turn ign.on pump should get power for about 3 seconds,if not ck pump relay

i heard that if my oil pressure sensor was faulty that my fuel pump would not energize. is that true?