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On the left side of the engine bay there are two metal lines coming from below. These join to rubber hoses.
One of the rubber hoses goes to the fuel preheater (the rectangular device in the side of the cylinder head with 2 hoses connected). This is your supply line.
The other rubber hose goes to a fitting on the fuel filter. This is the return line.
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)
1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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