Hi my crafter is a 2008 2.5 diesel, i think that when left standing the fuel runs back to the tank as sometimes when start first thing it seems to run weak in that it stops and then spins and wont fire straight away, so is it possibly for this situation to happen and if so is it to do with the lift pump in the tank, i take it there are non return valves in the system some where there.

Thanks.
Brom.