Vacuum line - carb to dist.

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.

Bill wrote:

> 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.
>

This is a case where size does not matter :-)

Speedy Jim
http://www.nls.net/mp/volks/

On Mar 18, 1:14 pm, "Bill" > wrote:
> 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?

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

Harry Smith wrote:

> On Mar 18, 1:14 pm, "Bill" > wrote:
>
>>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?
>
>
> 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
http://www.nls.net/mp/volks/

On Mar 18, 5:13 pm, Speedy Jim > wrote:
> It's an anti-siphon loop, to keep fuel droplets from being
> sucked into the vacuum chamber.

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

Harry Smith wrote:

> On Mar 18, 5:13 pm, Speedy Jim > wrote:
>
>> It's an anti-siphon loop, to keep fuel droplets from being
>> sucked into the vacuum chamber.
>
>
> 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 :-)

"Speedy Jim" > wrote in message
et...
> Harry Smith wrote:
>
> > On Mar 18, 5:13 pm, Speedy Jim > wrote:
> >
> >> It's an anti-siphon loop, to keep fuel droplets from being
> >> sucked into the vacuum chamber.
> >
> >
> > 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........

On Mar 24, 7:49 pm, "Karl" > wrote:
> "Speedy Jim" > wrote in message
>
> et...
>
>
>
> > Harry Smith wrote:
>
> > > On Mar 18, 5:13 pm, Speedy Jim > wrote:
>
> > >> It's an anti-siphon loop, to keep fuel droplets from being
> > >> sucked into the vacuum chamber.
>
> > > 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........

This part is to prevent deterioration of the diaphragm in the vac
cannister of the distributor.