A few years ago while driving the Jetta up Interstate 5 in Northern California the fuel light came on. Knowing that it had 2 gallons of gas left, I continued on only to run out of gas about 15 miles later and 5 short of our destination. Somewhere in the system the signal is damaged and it now reads high. That is, it says there’s more gas than there is. In VW’s infinite wisdom, I can adjust the calibration with my VAG-Com tool. I electronically “took some gas out” of the tank to the limits of the car’s system and it’s still high. I am prepared to buy a new sending unit, but suspect that something more is afoot. Perhaps, like on the BMW motorcycle I own, the ground is corroded and simply supplying the sender with a stronger ground will fix the problem.
Add it to the project list, which if you’ve been reading this site, is clearly very large and growing.