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Re: How to determine if fuel pumps are good? (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by Mike W. on October 01, 2001 at 01:01:23:

In Reply to: How to determine if fuel pumps are good? posted by jeff26 on September 30, 2001 at 09:05:18:

Your car will run if the main pump is good, whether or not the in tank one is good or not. Beyond that, they can fail in at least two different ways, they can quit completely, which is actually good, and you might make it home by whacking it as it is probably worn out brushes, or they can get too weak to really make the car run but still pump, and that is tougher to troubleshoot as the pump runs and will build up pressure but not with enough volume to really make the car run but it will fire and try to start. I had that one happen on vacation a couple of years ago coming back from Las Vegas and got the strangest look from the CHP officer when I told him I had diaginosed it as a bad fuel pump and was getting ready to put a spare in. I pack a spare fuel pump and a spare voltage regulator on long trips as they are hard to tell the condition of and expensive and hard to find on the road.
Mike W.

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