[urq] Fuel tank vent

[Patrick Carlier]

The way it is on my car :

The small metal outlet on top of the tank goes to a rubber braided hose , 
wich connects to  a black plastic pipe .
That one goes across the tank and makes a U turn to come back  .
Then it should connect  to the gravity valve .
The other end of the gravity valve goes to the white plastic  , wich 
dissapears behind the tank
and comes out somewhere near the bottom outlets  .
There's a large rubber grommet under the tank troug wich all fuel lines go . 
Including the tank vent line .

I guess that any gravity valve will do the trick , altough  I never tried a 
different one  .

Pat


----- Original Message ----- 
From: "Keith" <spotatashleys at hotmail.com>
To: <urq at audifans.com>
Sent: Monday, June 17, 2013 10:52 PM
Subject: [urq] Fuel tank vent


> After not being used for a period I get the smell of fuel in the cabin. I’m 
> not losing any fuel but I do have a few questions about the fuel tank vent 
> set up. I have one large braided rubber pipe (about 15-17mm diameter) that 
> runs from an outlet on the top of the tank to the filler neck which I 
> guess allows air to be displaced quickly when filling up. This feels like 
> its integrity is intact and doesn’t show any visual signs of porocity. 
> There is another much smaller pipe that also runs from an outlet on the 
> top of the tank as a braided rubber pipe across to the right hand side and 
> then changes to a smaller bore plastic pipe, does an about turn, runs back 
> across to the left hand side and disappears down behind the tank and I 
> guess exists somewhere below the cabin. I have not yet discovered where it 
> does or should exit (any suggestions?)
> My questions though relate to the method of venting. I guess this small 
> pipe is not so much to let air out, but more to let air in to prevent a 
> vacuum being created as the fuel level drops. Is my thinking correct? My 
> family album picture of the tank vent set-up includes a gravity valve. 
> Mine does not have a gravity valve. Did all urqs (mine is a WR) have a 
> gravity valve and so should mine have one? As the part is NLA will one off 
> a VW Polo do the job? (I guess the gravity valve should allow air in and 
> stop fumes – and fuel if the car was inverted! – from getting out).  So 
> there’s a few questions there. If you can answer any I will be most 
> grateful.
> Many thanks
>
> Keith
>
> ‘87 WR
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