Yeah I tried that and the dealer reloaded software and it worked for a few weeks but eventually failedthanks for posting this. very interesting. I am actually looking at #6, because that is me. I fill up when it's convenient and no doubt I am sure I fill up many times when I have used less than 5 litres from a full tank (and yes, I am one of those that fills the tank to the very top, every time!
according to the doc, it says the sending unit is not damaged and does not need to be replaced, assuming my case is as stated.....I will give the workaround a shot and see what happens.........