Overfilling theory (input needed)

[Cogeneration]

Originally Posted by Jcp385

I'd say it's good practice to stop at the first click. It's why your filler cap and the gas pump will say do not top off. As I said, I miss the extra range and the (probably, maybe) more accurate fill data from stuffing the tank, but it's not worth the possibility of having to prematurely replace the canister. In mine, it's a $300 part for a car worth maybe $800.

Not sure if diesels even have a canister? Diesel doesn't evaporate like gasoline does.

Diesel's have no evap system. My 2011 Golf TDI I always filled to the brim. My 2015 XV Crosstrek Subaru gasser, first click and I'm done. Not going to take any chance on killing the charcoal canister.