Gas gauge gone nutty, Advice please

[pred]

I just bought this TI and I filled the tank when I got it two weeks ago,
There have been no issues until last night, I was at 1/4 tank and it would read 99 miles to go on the display, I had to drive to work for an emergency power outage and it was raining pretty good, Only 5 mile drive,
A couple hours later I drive the 5 miles home now in a drizzle and when I pulled in the drive way I noticed that the fuel gauge was reading nearly 3/4 tank and reading that I could go another 150+ miles,,,
So something had gone wacky with the fuel gauge system.
Where would I look first?
I am assuming a connector somewhere is getting wet and causing this issue,
But being new to BMW I really have no idea where to look first.
Thanks for any advice you may have,
And yes there is about 275 miles on this tank so I know it's not at 3/4.
Thanks !
!
!
!

Peter

[bmvw]

Mine does something similar. Try pushing in the instrument cluster next to the odo reset button, if that clears it up there is a bad connection in the instrument panel. If that doesn't do it, the gas tank float wiring is under the back seat, look to see if it is pinched or wet.

[shortskinnykid]

bmvw mine is doing the same thing and pressing by the reset button makes the needle move. Where do I look for the bad connection in the cluster and do you know if the wheel needs to come off to remove it? Thanks.

[jca]

Try running a can or two of Chevron Techtron gas additive though the fuel system. I think you have a corroded sensor connections in the gas tank. I had the same problem in my Z3. The Techtron certainly won't hurt anything and it fixed my Z3.

[bmvw]

I've not done it, I just live with it because the low fuel quantity light still works.
There's some DIYs on this site as to the instrument cluster, I know it's not a trivial job.

If you do take off the steering wheel, there are a couple common problems to look for while you're in there, one is the lock cylinder and the other is the steer gearing which can get squeaky.