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I have not read of anyone adding a check valve on their Mercedes but just for reference there is inline fuel check valves that you can add on if that is what you want.
Some of them can be taken a part as in the pic. Some are metal but cannot be taken apart and there is also plastic/nylon ones.
I bought some plastic ones and some Metal ones on ebay but have never used them on anything. But, anyway eBay is one source and likely Amazon.
I have never seen any at Auto Part Stores nor even industrial hardware stores but it is likely NAPA would sell them or Mc Masters Karr or Granger would have them.
Where I worked we added one a similar type of check valve on a Caterpillar Truck Engine. We knew that the fuel was migrating back to the fuel tank and even pulling fuel out of the fuel injection pump housing but never figured out exactly why it was happening.
Installing the check valve in the fuel inlet line cured the symptoms cheaply and the Truck Driver was happy to get in the shortest time possible.
I have also read of inline check valves being used on Equipment where the Fuel Tank is a long ways away from the Engine.
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84 300D, 82 Volvo 244Gl Diesel
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