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Re: [T3] gas cap / gas tank venting


On Sat, 2005-02-05 at 23:22, C.Rochambeau wrote:
> > 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. 
> 
> My gas cap has been so vacuum sealed it has taken me getting out of the car and hitting it
> with a "mallot" because neither the attendant or myself could unscrew it by hand. The car
> also *refuses* to take gas at any rate higher than a slow dribble. One of her favorite
> tricks to play on the gas attendant [I live in Oregon where we are deemed unable to pump
> our own gas] is to spit gas at them from the fill tube if they do not heed my meticulous
> emphasis on "extremely slow fill".
> 
> Is this related to the venting system as well? [Makes sense to me that it does]
> 
> Do you just run a hose downward through that hole and vent directly to the atmosphere? 
> 
> Going to spend a little time with the car tomorrow and it would be nice to get this fixed.
> 
Your tank shouldn't act this way. There should be about a 5/8" vent hose
running from the R. rear corner of the tank to right below the gas cap.
This is to allow air back out, as the tank is being filled. 
On the L.rear corner of the tank, there is a vent line that is about
1/8" diameter. The fitting on the tank where this connects is sometimes
rusted closed. This vent line went up, and across to a T connected near
that 5/8" line. It also went to the charcoal filter that was located
under the left front fender, or over the transmission, or the engine
compartment, depending on the year. 
The metal lines going to the charcoal canister are probably rusted
closed by now, and you are not venting the tank properly. Try blowing
into the 1/8" line into the tank and see if that is open. If it is, then
reroute this hose up as high as you can in the trunk, then out into the
the area behind the spare tire.
The upward loop is to keep it from siphoning gas when the tank is clear
full.

-- 
Russ Wolfe
'71 FB AT
'66 FB MT
'64 T34 (not running)
'65 T1 (not running)
russw@classicvw.org
http://www.classicvw.org

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