I started the car again, and I am getting a solid stream of bubbles coming through the clear fuel line running from the overflow valve on the back of the IP to the large filter. Is that the return line you are asking about?


I don't get this as I have probably run the engine for 15 minutes total. Yesterday, I also pumped the primer pump for between 5 and 10 minutes. It filled the clear fuel line mentioned above, and then some. I never heard any noise from the overflow valve while priming, as Funola suggested.

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1983 240D low miles 156000, and yes, MB still gives out badges