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Re: [T3] gas cap

On 5 Feb 2005 at 11:36, Kevin Guarnotta wrote:

> I notice that my gas cap often times feels difficult to pull off, and I hear
> a hissing noise when I take it off. I thought that I was supposed to have a
> vented cap, and that maybe mine was not. But when I check the Bentley
> Manual, it says my cap should not be vented.-so I imagine one of those hoses
> going to the tank vents it? Perhaps mine is clogged?

The tank is vented, but not thru the cap.

Remove the liner in your trunk and look at the hoses at the rear of the tank. 
There will be some small ones which are the vents. In some years, some of them 
will eventually turn into metal lines, which have rusted solid inside. You need 
to either replace those lines or provide an alternate vent path.

On cars from '70-on I disable the overflow tank and charcoal cannister, because 
they are all shot by now and the steel lines are now completely blocked. I just 
run a hose down a hole that is at the LF corner of the gas tank, now plugged by 
a rubber plug. On these cars there is a line that runs horizontally across the 
top of the trunk just below the vent louvers. In '70 this line was steel, but 
in '71 it got changed to polyethylene. I replace the steel lines with the later 
poly ones.

It's fairly important to fix this. Any significant vacuum will produce a 
significant force over the total area of the gas tank. I've seen tanks which 
have been crushed by this force.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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