I am tracking down a hard shifting SDL problem with the vac and can't seem to find an answer to this in any of the posts.

.If I pull a vacuum with MityVac on the single 4mm line that comes off the vacuum pump (and heads to the 5way junction) and it won't hold vacuum, is this diagnostic of anything?


The vacuum just seeps away and I can hear a slight buzzing. This doesn't seem right. The rest of the vac system is tight. I was planning on testing the output of the vacuum pump over lunch hour, hoping that it is between 21 and 23 in, my suspicion is that it may not make the grade...

thanks

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84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double