mettling

I left the gas cap on the pump the other day from my 98 A6 2.8Q. I drove about 300 miles before I could replace it, and now the gauge doesn't work - goes down to about 3/4 when it should be at 1/4. Is the fuel sender shot just from leaving the cap off?

phred

No gas cap really freaks out the fuel systems on modern cars. It sounds like you need to "reboot" the electronics. I suggest you fill the tank to the brim and tightly snug down the gas cap. If things don't settle down after a few days, it's time to visit the garage. It's not the sending units.

2.7tDallas

Try disconnecting your battery. read the owners manual about reconnecting

Max9

Or could it be the fuel gauge TSB. What year is it?

mettling

it's a 98 - I'll try the battery tonight.

Thanks