Shouldn't the valve be closed when you refill?
I did read that, unlike diesel or petrol, you should accept the 'full' signal from the pump - if you keep going, you'll be forcing it past the 80% fill which is dangerous.
Hi Jean - Yes, the valve to the habitation system is closed when filling but there is another valve on the top of our tank that we shut off after filling up which is on the inlet side.
As for accepting the full signal from the pump, it is a little more problematic than that. We tried to fill the tank after spending two weeks in the van cooking and heating on the gas so I know we used a fair bit, but the pump kept cutting out after only a few seconds of trying to fill. No way was the tank filled that quickly!
Definitely need to get it to someone who can take a proper look.............