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A quick Relay test for both Fuel Pump & EEC Power Relays is to Swap relay w/Horn Relay & try to start - as long as Horn does honk
Operational Sequence, Depiction & Wiring Diagram in 92-95; "...Operational Sequence: When the ignition is switched to the ON position, it turns the EEC Power Relay on.
The EEC Power Relay provides power to the EEC-IV processor and the control side of the fuel pump relay. Power for the fuel pump is supplied through a high current **** fuse ). Current flow is then through the fuel pump relay and Inertia Fuel Shutoff (IFS) switch to the fuel pump. The IFS switch is a safety device used to shut off the fuel pump in the event of a collision. If the IFS switch is "tripped," it must be reset by depressing the white or red button on the top of the switch.
If the ignition switch is not turned to the START position, the EEC-IV will shut the fuel pump off after approximately one second. The PCM will operate the fuel pump when the ignition is in the START position to provide fuel while cranking.
After the engine starts, the PCM will continue to operate the fuel pump unless the engine stops, engine speed drops below 120 rpm, or the IFS switch is "tripped." Note: Grounding the FP lead at the DLC will allow the pump to run continuously with the ignition switch on.
MIESK5 NOTE; from Ford EVTM; The Control Module (PCM) runs the pump for one second when it receives an ignition- on signal.
It also runs the pump as long as it receives a PIP signal from the Hall-effect devices (inside the Distributor), it continues pump operation even after the key is released from START. If the PIP signals fall below 120RPM, the control module cuts off the signal to the fuel pump relay. MIESK5 Note, The PCM then opens the fuel pump relay ground circuit. The pump will also run when the terminals of the fuel pump test connector are jumped. the Control module signals the pump when it receives a CRANK signal, and when the Control module gets PIP signals that the engine is running. the pump does not run if the PIP indicates the engine is not running even with ignition ON {except for that first one second}. (MIESK5 Note, A timer circuit in the PCM will open the ground circuit to the fuel pump relay, causing the fuel pump relay contacts to OPEN)..." READ MORE
http://www.thedieselstop.com/faq/9497faq/maint/vra/vra09001.htm
Power Distribution Box Diagram in a 93 Bronco & F Series
Source: by Steve83
No Start Troubleshooting but Starter Cranks Engine in 4.9, 5.0, or 5.8L; "....TIP 1: Since a lot of folks confuse a No Crank Condition with a No Start Condition... I'll clear it up right now: In a No Start Condition means your vehicle's Starter Motor is cranking the Engine but the Engine is not starting. In a No Crank Condition, the Engine is not cranking when you turn the key to crank the Engine. This article only deals with a No Start Condition..." read more
Source: @
http://troubleshootmyvehicle.com/ford_no_start_4.9L_5.0L_5.8L/diagnose_no_start_1.php
EXCERPTS:
•Test the PIP Sensor..
◦The PIP Signal is at the heart of the Ignition System and it triggers the Ignition Control Module to start activating the Ignition Coil.
◦The PIP Signal is also used by the PCM to start injecting Fuel into the Cylinders.
◦You can test the PIP Sensor on your Ford vehicle.
◦You can find the PIP Sensor Test here (the test is bundled in with how to test the Ignition Control Module):
◦Distributor Mounted Ignition Control Module Test ◦
Fender Mounted Ignition Control Module Test