View Full Version : Fuel Tank Vacuum on my '94 740iL
Jazzman
06-26-2010, 10:18 PM
Why is it that whenever I fill up and remove the gas cap I always get vacuum in the gas tank. Is it normal? Does it affect fuel delivery to the injectors? Just curious if that's the reason for my poor idle quality and gas mileage.
shogun
06-27-2010, 12:03 PM
that is a well known problem on the E38, I read about some cases where the gas tank even collapsed.
Check the tank de-airation system.
www.realoem.com
poor idle is also an effect of this.
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