I have just fitted an Eberspacher D2 night heater to my VW T4 camper and have a problem with the fuel supply. I inserted a 'T' piece into the fuel line which runs from the fuel tank to the fuel filter - the 'T' was inserted about 5cm from the filter - but the heater only operates for about 5-mins before it cuts out due to fuel starvation. I had a D2 heater fitted to my previous T4 about 3-years ago by an Eberspacher approved engineer and a similar problem occured and I can't remember how the problem was overcome although I recall that he may have fitted a non-return valve as a solution. I do remember him saying that the heater was only operating whilst there was fuel in the hose and once depleted was cutting out. Can anyone please offer me advice on how to overcome this problem?