Intermitent Fuel Problem - BMW Forum -

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post #1 of 3 (permalink) Old 09-17-2005, 11:05 AM Thread Starter
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Intermitent Fuel Problem

I seriously need help. I drive a 1985 535i (e28) and its been in the shop for over a month. Its not even a dealer, its a garage that speciaizes in BMW's, especially the old ones. They are stumped and they come highly recommended. The car will randomly shut off/not start sometimes, even after driving it on the highway for about 20 minutes, and ive replaced the relays numerous times, doesnt help. There seems to be no pattern to it at all and it wont even happen for the mechanic. The car will start again after about 45 minutes to an hour of sitting. Fuel pressure and what not are all where they are supposed to be. Any help/ideas? Its a manual if that matters any.

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post #2 of 3 (permalink) Old 09-17-2005, 12:24 PM
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i had the same exact problem with a old Honda i had. i replaced the fuel filters and the ignotion coil and it ran perfectly. there should be a filter near your gas tank and one in the engine bay. it could also be your fuel pump.
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post #3 of 3 (permalink) Old 11-18-2005, 09:43 AM
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My '89 525i has has fuel issues since i've had her. Right now it's sitting in my driveway not going anywhere. I kinda need help, too, but i'll tell you what i have done so far to try and fix it.
1) Replaced fuel pressure regulator 3x - Use only BMW part. No one else sells anything that works well (PEP BOYS, Western Auto, Advance, Auto Zone). Fuel pump in gas tank was OVER pumping and blew out the regulators i replaced which led to an over fueling problem which made it hard to start. If i shut off engine before completely warming up it would not start back up until at least fifteen minutes later.
2) One technician installed a fuel pressure regulator for a 7 series which ofcourse did not work.
3) Car is worse than ever now. She runs like i have water in the fuel, but it isn't water. Seems like it's running on half the cylinders (when it runs).

I hope something in here helps you find your issue, maybe something you havent thought of yet, but I would be interested in knowing what you end up doing to fix yours. The three different techs who worked on mine are stumped as well, but they still keep charging me for doing nothing.

SIX of all this BS: .
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