I was thinking of replacing my vacuum advance line from my 34PICT3 to the SVDA dist. and recalled a friend's rock stock 71 bus with the original metal "up and over the float level" line. In understand why VW did this, but here's my question: Is the actual inside diameter of the line critical - not where it hooks up to the dist. or carb, but the actual line ID itself. More specifically, is the vacuum signal to the dist. the same with a 3/64" ID line vs. say a 3/32" ID line? TIA Bill.
Vacuum line - carb to dist.
Mar 18, 2007
7 Replies
This is a case where size does not matter :-)
Speedy Jim
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What is the reason for the "up and over the float level" routing of this vacuum line, and is it important? I just used a bit of rubber hose here...
Peace, Harry
It's an anti-siphon loop, to keep fuel droplets from being sucked into the vacuum chamber.
Speedy Jim
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It doesn't seem like there would be much in the way of flow there...is this something I need to worry about?
Thanks, Harry
Well, I wouldn't obsess over it :-)
But keep in mind that VW made a tube for this 'problem'.
VW would not have spent the time on R&D and making and installing a not-needed part........
part........
This part is to prevent deterioration of the diaphragm in the vac cannister of the distributor.
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