The fuel warmer (heat exchanger) in my '87 SDL was disconnected by the PO during investigation of a possible fuel or oil leak. Leak turned out to be from the Injection Pump, but the fuel warmer was never reconnected since car lived in Texas.

It now resides in Canada and with winter approaching I thought I'd better put it back to work. Does anybody know if it matters which way the fuel warmer is connected? It is not obvious and I'm not sure if it has a check-valve that might make a difference. The manual barely covers this item at all and the picture doesn't clearly show the connections.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

Does everybody here live in the South !!!???

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown