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Originally Posted by t walgamuth
the fuel return lines are the most frequent source of leaks. and very easily changed. they go in loops from injector to injector. i would buy them from the dealer or a mb parts supplier. they are cheap easy to replace and last a long time...but not forever.
tom w
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Yep.
Or it could be that the rubber hoses that attach to the plastic fuel filter, or the "cigar hose" that attaches the large fuel filter housing to the hard fuel return line, are old and leaking. Inspect all of them closely, and move them around. If there is dry-rot, etc., you will see cracks and/or wetness from leaking fuel.
Also, under the rear of the car, there are two short rubber hoses that attach the hard fuel lines to the fuel tank itself. When I first bought my SD many years ago, these were VERY dried out, and were leaking terribly.
Mike