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Idahome
Joined: Wed May 2nd, 2018
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The way this system works is the EEC (PCM) fuse and relay kick on with the ignition switch thus powering the PCM
The PCM then energizes the fuel pump relay
The fuel pump relay has its own dedicated fuse and the power is sent through the inertia switch
power is then sent to the fuel pump
It should be battery power, not more
You can always put 12V directly to the fuel pump and see if it runs
Then test the truck side of things for the 12V (like you did)
This should be done before you pull the old pump LOL, but you know I had to learn the hard way and replace a bunch of pumps that actually worked to find out I should have tested the electrical side of the truck things first LOL
Fuel pump fuse and relay are suspect
Inertia switch can be bypassed (jumpered) for testing purposes
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks