I am new to this site and would greaty entertain the idea of help on the 300 TD wagon. The car can only be shut off manually under the hood, which leads me to the area of vacuum. So I pulled off one of the lines and blew into it I heard what appeard to be air bleeding off somewhere in the area of the Vac/pump. There is a tree also in that area but it seems to be sealed. could I be feeding back pressure into the pump? And, where is the supply comming from? Thanks in advance.