Okay, first of all, I am confident that this problem is in the wiring of the fuel pump circuit.
This is what you need to do: With a voltmeter (or in a pinch, a test light), you need to test the wires at the fuel pump relay the next time you turn on the key and the pump doesn't prime.
There should be 5 wires going to 4 terminals at the relay.
With the key OFF, they should test as follows:
Orange/Lt Blue wire = Battery Voltage (whatever the voltage is at the time across the battery terminals)
All other wires = Zero Volts
For 2 seconds following turning the key on, but not starting the engine, the wires should test as follows:
Tan/Lt. Green wire = Zero Volts
All other wires = Battery Voltage
Please check this and post the results.
Take care,
~Chris
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