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x98boardwell x98boardwell is offline
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Join Date: Sep 2006
Location: Central Valley, CA
Posts: 1,522
Help!! Fuel Relay Question.


I have a weird dilemma happening with my 87-930. While reading this post, keep in mind that the car ran beautifully 1-week ago and then I tried to start it today and this happened.

When I take out one of the fuel pump relays, the other pump still works, and visa versa. When I put both relays in (which is normal) neither pump will even turn on.

I'm guessing that for some reason I'm not getting enough power (electrically) to turn on both pumps. What the heck could possibly be wrong.

1) Does someone have a wiring schematic that shows where the power for these relays comes from?
2) Would the over-boost switch cause this to happen if it fails?
3) What about a ground? Could a bad ground effect the ability for only one pump and not both come on?

Thanks for your help in advance. I purchased 2 new relays just in case and now probably do not need them. I wanted you to know so we don't think that is the issue.

Old 05-02-2008, 04:31 PM
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