I am trying to figure out the direction of flow on my 1978 300CD. There are two lines coming from the tank. At the main filter, there is an in and an out arrow, which makes sense. There is also a line coming off the top of that filter that connects to the "cigar" hose. Basically, I am trying to determine which line is bringing fuel into the injection pump. Any help would be greatly appreciated.

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1978 300CD
1985 300TD
1999 Land Rover Discovery II
rover1@sbcglobal.net