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Foaming return line in Fuel Delivery Unit ML320 CDI W164 at work
Recently I have replaced the Fuel Delivery Unit part#1644702094 by another with #1644700394. The old one was very high pitch noisy and gave me two CEL lately so I decided to anticipate the roadside risk and made the change DIY. Before closing the tank hole I decided to test, hearing and seeing it while working.
Watch video here:
'08 ML320 CDI, '05 ML350(totaled by a soccer mom in a Tahoe), '98 C230 W202, '67 BMW 1800Ti
I realize this is an old post, but did you get a reliable repair? The reason I am asking is I recently did a cleaning of my EGR valve and in the process cracked the last fitting on the fuel return line. I am currently in the process of replacing it and was wondering if this could have been the source of your foaming fuel return line.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
Foaming return line in Fuel Delivery Unit ML320 CDI W164 at work
