I am having trouble with my '89 Bronco. I went to start it one day and it would turn over but not fire up. It seemed like a bad fuel pump. I removed the pump and found it does work, however it doesn't work when installed. It apparently just isn't getting any power. After determining it isn't the relay I spoke to someone who suggested checking the inertia switch. I have looked and looked, though, and just cannot find the inertia switch. If anyone has had the same problem or may be able to help I would sure appreciate their advice. Thanks.

 

My old 89 F-150 had the enertia switch behind the brake pedal on the firewall.

Check the ECM relay also, it's right beside the fuel pump relay by the driver side fender.
Mine did the same thing. I was able the run a jumper wire straight to the fuel pump and get it to work.
The ECM triggers the fuel pump with the key is turned on.

Hope this helps.

 

i had the same problem on my 87 f-150. It was the computer that runs the efi, ignition, etc. Hope this helps.

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1987 F-150 300 L6 4sp 2wd
K&N, flowmasters