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Old 07-13-2015, 11:22 AM
cn90 cn90 is offline
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Join Date: Jun 2014
Location: Omaha, NE
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Agree on siphon pump being the culprit.
Common issue in E39 and E53 etc.

If you don't want to fix it (the siphon pump), then keep gas ABOVE 1/4 at all time.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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