Please help. I bought a 1997 C-class 250TD about 8 months ago with 68,000 miles on it hoping that it would give me years of trouble-free motoring. Everything was fine until the weekend before last, when it suddenly lost power. The AA man came and took off the fuel filter, which was full of black contamination. So I paid £170 for a man to come along and empty the tank, assuming that this would solve the problem. After about 30 minutes there was no more fuel coming through, so the pump-out man put 10 litrs of fresh clean stuff in and that wouldn't pull through (well, it does, but it's a proper trickle!). Clearly there is a blockage / restriction somewhere - we tried pumping some diesel back to the tank from a jerry can under the bonnet using the AA man's syphon pump and it was as stiff as; it didn't want to flow at all. So..... the car is still running (I drove it back from Kent at the weekend), but it takes forever to get to 75 mph on the motorway and you get seen-off by cyclists at the traffic lights because it simply cannot draw enough fuel to get past 3,000 rpm. I have phoned a number of Mercedes 'specialists' today and nobody seems to be able to shed any light on this problem (apparently these cars never go wrong - apart from mine it would seem!). I don't know whether to just blow the fuel line back to the tank with an air line or carry-on chucking money at it - it seems my next option is to take the tank out which will cost about £400 I'm told, and still won't necessarily solve the problem. PLEASE help, this is doing my nut in! I knew I should have stuck with petrol .