Hi Everybody, After changing the fuel filter, I had a problem with the adjustment knob on top of the fuel filter on e250 diesel 1995 ( non Turbo). When I closed the adjustment knob clockwise the car loses power, very diffult to drive but the engine still runs. However if I loosen the adj knob a little bit, the car drives normal but consumes alot of fuel. I would like to know what is the function of the adjustment knob and what the correct setting should be. Thanking you in advance.