Hello,
It looks like either the fuel pump is not getting 12V feed from the relay or the ground is not being switched by the inertia switch.
When you supplied the fuel pump with external 12V, did you only supply this to the white/yellow wire or did you also supply a ground to the white/red wire ?
See partial wiring diagram attached.
As you can hear the fuel pump relay click this indicates that the control, switch on side is working. We do not know is the switched side is working. Please check first that fuse 3 in the interior fuse block is in order and that it is supplied with 12V with ignition on. This can be done by either using a test light or multi meter.
If the fuse tests okay, then next please check that you get full battery voltage a the white/yellow wire at the fuel pump. This can only be done with ignition on but keep in mind that the fuel pump relay will only stay energized for 2-3 seconds without the engine running. So, you will need to cycle the ignition off/on and then immediately check the voltage at the fuel pump terminal
How to use a multi meter.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
How to use a test light.
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
How to test a fuse.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
How to test a relay.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Please let us know how you get along.
Cheers, Boris
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Friday, January 21st, 2022 AT 1:54 AM