BMW X5 E53 Anti theft fuel cap

[andrewwynn]

Originally Posted by talljames

I was going to say that….one spark..ka-boom!; Haven’t heard of the anti roll ball before. Interesting. Is that on all models including mine? 2005 E53 or just a later addition.

I think it’s actually a valve associated with the carbon filter. It will close with the same signal that sets off the airbag and disconnects the main battery cable. I don’t think there’s any check valve in the filler neck. The cap is meant to hold in the fuel at any attitude even upside down.

I think the dsc related attitude sensors can detect “upside down” and will also close all the fuel venting in a slow speed rollover that might not trigger airbags.

These are my guesses, I recall reading about both those mechanisms but it was a long time ago.


–awr–

Using Tapatalk VIP on iPhone