[T3] 71 Squareback MT/FI - Mystery Hose / Canister
Jim Adney
jadney at vwtype3.org
Sun Feb 18 11:31:23 PST 2018
All those parts are part of the vapor recovery system begun in '70. Those
parts stopped being effective decades ago. That system consists of the
following items:
Hoses and steel lines above the gas tank that carry overflow gas and fumes
to an overflow tank under the LF fender.
Hoses and lines that run from the overflow tank to a charcoal cannister
above the transmission (to the left of the engine on '70s.)
Hose that carrys slightly pressurized air from the L fresh air elbow to the
charcoal cannister.
Hose that allows air and gas fumes to be sucked into the air cleaner on the
R side.
On 17 Feb 2018 at 15:29, Wisconsin Spryers wrote:
> My questions are:
>
> 1) What is the purpose of this canister?
The cannister is filled with activated charcoal to absorb gas fumes.
> 2) Is the routing of the hoses correct?
Yes.
> 3) Is there any maintenance required on this canister?
The cannister is supposed to be replaced periodically, but that's pointless
now. Here's why:
All the steel lines have long since rusted inside, blocking them completely,
so that fumes are no longer able to get from the gas tank to the cannister.
It's also likely that your overflow tank bracket has rusted away and the tank
is gone. Mike is correct, that this tank collects dirt and promotes rust in this
area.
The best thing to do is to remove the overflow tank, charcoal cannister, all
the lines and hoses, and plug the openings in the fresh air elbow and air
cleaner. The overflow kit that I sell includes parts to convert the vent system
back to the earlier version that vents to the outside. That's the only practical
solution.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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