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One way fuel tank vent valve...

uncle

uncle

Tuned and Synch'ed
Joined
Oct 28, 2008
Messages
89
Or I think sometimes called the tip over valve or pressure valve. It's the black and white disc shaped valve inline with the tank venting hoses. My question is does anyone know which way is up for this valve? Mine looks like this with the black part on top and white on the bottom:

valve2.jpg


Then this is a picture from another bike on a showroom floor:

valve1.jpg


Which is the right way? I'm wondering if this may have something to do with my hot starting problem on my Griso 1100...
 
Take it off and blow into the ends. Air will only flow in one direction. Install so air will go into the fuel tank.
 
It is a one way valve between the charcoal evap cannister and the tank.
I've since kept it "in storage" on the bench (along with the evap can) with no ill effect;)
 
So here's what I did today... I went out in the shop first thing this morning. Bike sitting there has not been started yet. I am looking at this 'pressure valve' and it says "tank" on the white side (in both english and italian) I figure that mean that side towards the tank. So I go to change it around and when I unhook the hose from the tank side of the valve I hear a hissing sound... in disbelief I put my ear to the valve and sure enough for 15 seconds (or longer!) this valve is making a hissing sound as it was sucking in air!

The weather has cooled off here today to around 60 degrees and the bike was running fine (as usual in such temps) - so I will have to see when it get hot again if this makes any difference - (was having that hard starting when hot - have to use some throttle to keep engine alive for a bit).

Still plan to remove canister some day, but for now I'm back to the 'well if it ain't in the way...' phase again. :unsure:
 
Those things are just a p.i.t.a. as far as I'm concerned. They give nothing but trouble, and cause lots of tank suck. I'm not exactly sure, but I think they are installed to prevent fuel spillage from the tank breather should the bike be lying on its side for long periods of time.

If you insist on keeping it on the bike, run a drill right through it. You'll never have any more trouble.
 
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