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Old 12-18-2011, 16:10   #1 (permalink)
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'87 Bronco II, both fuel pumps dead

The EEC power relay works and powers the Computer, however the computer is not turning on the fuel pump relay. I verified no open wire between computer and fuel pump relay.

I used the diagnostic link connector to test the fuel pump operation and they both still didn't operate.

I have a spare computer and swapping it out didn't change the symptoms.

I have disconnected the computer and manually energized the fuel pump relay. The pumps still don't operate.

Is there anything that may cause both problems or am I looking at 2 problems here ?

1. Fuel pump relay not being energized.
2. Open wire power/ground/or both to pumps.

Thanks,
Ron
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Old 12-18-2011, 16:24   #2 (permalink)
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Re: '87 Bronco II, both fuel pumps dead

Is there power at the relay? If there is, have you checked the inertia switch? Check the diagram here. Fig 1 1nnd 2 in the 87 model. http://www.autozone.com/autozone/rep...00c152800781b2
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Old 12-19-2011, 07:03   #3 (permalink)
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Re: '87 Bronco II, both fuel pumps dead

Yes Bert, there is power to the relay and when I energize it manually, power shows up on the other side as it should. I have the inertia switch bypassed so power gets through there too, but the pumps don't run.

Tonight I will try to find why power doesn't seem to make it to the pumps. After I find that, I still have the problem of why the relay doesn't get energized by the computer in the first place.

Seems odd to have two problems like this at the same time. I've got a feeling that there's just one problem that will fix both symptoms.

I'm wondering if disconnecting the computer could be a problem. I'll connect it back tonight and reconnect the factory bypass for testing the pumps.
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