Hi All IMy 2011 Superb wagon 3.6L has an unsual problem with its fuel guage readout on the dash. I have tried searching here for ideas several times but no-one seems to have had a similar problem to mine. Often when I start the car the fuel guage will read the correct amount then within a minute or two of driving the needle will drop to absolutely nothing ie as if it is not even connected. Sometimes when I turn off the car and restart it the guage will read the tank level correctly and the it will drop to nothing soon after.

It is NOT a problem of reading the amount in the tank in correctly. When it does operate the guage shows the correct fuel amount. It is simply that it provides a correct reading when I turn on the car and then soon after it doesn't show anything. I have tried cleaning the contacts at the fuel sender unit in the tank and I see nothing in VCDS which assists me.

Any thoughts on what is causing this - I don't to just buy parts without knowing they will solve the problem.

I had something like this on a Vauxhall once. Turned out that the mechanical arrangement of the sender unit in the tank had become a bit misaligned or bent so that the wiper contact(s) were losing their pressure against the carbon track(s) of the potentiometer in the tank.

A bit of gentle bending of a metal rod to improve the contact pressure sorted it.

No idea if the physical arrangements were similar enough to what you have for this to be a plausible explanation in this case.

Did you take any photos while the pump/gauge sender were outside the tank?

A dry/cracked solder joint at the instrument cluster connector might give similar symptoms too, I guess?

Wondering if you have had any luck fixing this problem, fuel gauge in my 1.8 Superb has started to have same issue.

I've had this issue on my 2009 3.6L sedan for a few years. Happens every now and again, but usually shutting off the engine with a full tank of fuel and then removing the battery overnight makes it go away for a good while. I suspect it has something to do with a bad solder join or bad connection. I have been told it is possibly rust / corrosion in the tank on the sender unit too.