M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Diesel Fuel Return O Ring and

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Old 06-20-2024, 10:36 PM
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'90 420SEL, '95-E320 COUPE, 2000 SL500, 2009 ML320 Bluetec
Diesel Fuel Return O Ring and

I picked up 2009 ML320 BlueTec last week, during my PPI the fuel filter was noted to have a fuel leak. During repairs a secondary fuel leak was noted from the elbow fitting that directs the fuel leak off from the injectors back into the filter and was held in place lock wire, the fitting was moving and coupled with a hard o ring its leaking. I've called the dealer they state I must purchase the complete return hose assembly (Part #A6420707553264) however I still need to locate a retaining clip. I need help ID ing the correct O ring and retaining clip if possible.
If no joy on ID-ing / sourcing theses parts I will need to replace the hose assembly any Ideas for the retaining clip?
I also need to replace the CLIC-R clamp on the filter connections, the last filter change screw clamps was used, I had the smaller CLIC-R clamp but need the larger of the two. A part number will help.
Thank you
Old 06-24-2024, 11:41 PM
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'90 420SEL, '95-E320 COUPE, 2000 SL500, 2009 ML320 Bluetec
I was able to locate the Clip and o-ring part numbers as Fuel Injector Return Line Clip A001-991-5870, the o-ring part number A000-078-0580. Thank you ID parts, Happy motoring.

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