Faster when fuller? What is going on?

[sgrice]

Found another posting by andrewwynn that addresses the siphon system. The link is here. I'll post on that link since I am taking this thread somewhat off topic.

[andrewwynn]

After some more research I need to verify my findings but I will be recommending re-working the non-seal seam as well as that seam leaked like a sieve before redone in both mine and wife's car.

I used an o-ring on wife's and Teflon tape on mine. I will be examining my Teflon seal after about five months and report back the findings. If as I expect the INERT Teflon is just as I put it in I will update my repair posts to reflect that (of course they will be revised to the FIXED method should the Teflon be an epic fail)

[Clockwork]

Originally Posted by Bmwtvboy

This may sound crazy, but its true 90% of the time. My X5,3.0 has 240K miles, most everything is original. I am noticing that when I have a full tank of premium only gas I get amazing quick peddle/acceleration response. Even the slightest touch and the X takes off smoothly. No issues. However, as I get closer to half tank it starts to become sluggish. At 1/4 tank or less its a very noticeable sluggish acceleration. It's so strange. Is this an indication that the fuel pump system is going? I don't have any SES light on either. Although, the other day, the tranny gear light came on, but it went off after starting it back up. What's going on with this amazing X5?

do you have the "fuel saver mode" option selected in your cluster hidden menu?
just kidding.