Hi,
As Kartek suggested, look at the tank strainer, this will be a good start.

You can blow on the valve, the pressure in it is really little, then no worries there.

I had trouble with the seal on the whole pre-filter assembly and by passed it, no more bugger for me there.

you need to refill the fuel filter in order to restart the car properly as it contain about 0.5 litre.

Doing the lift pump might help too, when I did mine there was a difference between the new non return valve and the old one.

Hope it help...

Olivier

__________________
E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...