I was having the typical vacuum system leak problems in the 82 300D, slow locks and slow shutoff, so I broke out the vacuum tester and started testing. I got to the trunk element and tested it by removing the lines from the Y-connector where the fuel filler door is and testing from there. Tests showed that the element was leaking, so I removed the element from the trunk and tested it. Removing the element and testing it showed NO LEAK. I decided that the must be in the hard yellow lines running from the Y-connector to the element. I tested both lines and found no leak. This is weird, there's no leak in the lines running to the element, and no leak in the element unless it's installed and hooked up. Why in the world is the element only leaking when installed?

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.