Re: Evap Emmisions System (was RE: [T3] ?fuel pump DEAD!!)

[Jim Adney <jadney@vwtype3.org>]

On 18 Aug 2009 at 13:59, Adriel Rowley wrote:

> How did we live when the kits first came out, and rarely heard about the 
> overflow kits?

Before the kits existed we talked about how the overflow hose was a big problem 
with no easy solution. Each owner had to try to come up with his own solution, 
but that was a LOT to expect. This was all before you joined the list, so you 
would not be aware of it.

> Maybe include the price and the kit in the rebuild.  

If I find water damage inside the pump I always email the owner, mention the 
likely cause, and quote the price of my kit. Sometimes they buy and sometimes 
they tell me that they have already provided their own fix. That's fine with 
me, but I'd really like to see a reduction in the number of water damaged pumps 
that I see.

> I can see that with math.  Now, the question is, can a system generate that kind 
> of pressure?  Also, and the pump pull that hard?

Easily, it's only 3 psi over what it normally does.

> But, how many of the kits you sold, will the owners follow, or be able to follow, 
> this?  Sometimes one has to fill up before errands.

Filling up before errands is no problem. The only problem is filling up and 
then immediately parking for the whole day.

> I took a look at what all I had.  There is a rubber line running of the tank and 
> another off the filler pipe, that come to a T, then a short rubber hose, to a long 
> metal line, down to a plasic line, and I think to the tank.  Then, metal line from 
> the tank, more rubber, and a long line, more rubber, another line, more rubber... 
> and ends up to the charcoal canister.

That sounds right, except the tube running to the expansion tank is steel. On 
your '71 there is a plastic tube running across the top of the trunk followed 
by a plastic hose that runs down the driver's side to that steel tube that runs 
out thru the grommet to the expansion tank.

On earlier cars, the line across the top of the trunk was also steel, but they 
fixed that by '71.

> So, if one was to replace the system, they would need about six feet of line, and 
> five feet of rubber hose.  Does it matter the wall thickness, or if it is welded?  
> The same place sells 1/8" O.D. welded tube for just over $9 for six feet.

I think there is a lot more than 6' of steel line, but less than 5 feet of 
rubber hose. That front to rear steel line starts at the top of the fender, 
comes down, runs the length of the rockers, around the jack point, and up the 
rear to the charcoal cannister. The rubber hose is probably still fine.

The hard plastic & steel lines are closer to 3/16" than to 1/8".

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI USA

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