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Griso Fuel Cap leak

B

Brent S

Just got it firing!
Joined
Oct 18, 2014
Messages
21
Location
Melbourne
Hi all.

Had the 2014 Griso in for its first service recently, and as part of that I had the fuel tank breather tubes checked, as I was getting pressurisation in the tank. Now there's no pressure build up, but I can smell fuel anytime the bike is stopped. Checked the cap and it's definitely coming from there, like the rubber seal isn't sealing properly. Can see the wet fuel having bypassed the seal. Not leaking anywhere else. Definitely the fuel cap seal.

Not sure whether it was mere coincidence that this has started immediately after the service guys lifted the tank off to check the breather pipes, but it seems weird. Have checked the seal for dust, dirt or damage and it's all clean, as you'd expect for a 6 week old bike.

Any ideas? Fix? Thanks.

Brent.
 
Prime suspect is kinked / trapped /squashed breather pipes. It's very easy to get it wrong when putting the tank back on. Everything looks fine as you lower the tank back into place but as the pipes are quite soft & flexible they don't always push thru' the space and bend instead. I had exactly this problem. It was most evident when I filled the tank brim full with a hot engine = the fuel expanded with the engine heat and the 'leak' was plain to see. I guess with a partially filled tank you would get the smell without any liquid evidence. With care and a bit of fiddling I managed to re-route / straighten the breathers without completely removing the tank again.
 
Will, you make a good point, but the tank is now 'breathing' fine, as there's no pressure in it when I open the cap. Previously, there'd be a big woosh of pressure when I opened the cap, so it was certainly sealing very well before (i.e. when the breather pipe was blocked). So, I've assumed that the breather is now OK. Its just that the rubber seal around the cap appears to have failed, or at least its not sealing as it was before. That's the weird thing.
 
Brent S said:
Will, you make a good point, but the tank is now 'breathing' fine, as there's no pressure in it when I open the cap. Previously, there'd be a big woosh of pressure when I opened the cap, so it was certainly sealing very well before (i.e. when the breather pipe was blocked). So, I've assumed that the breather is now OK. Its just that the rubber seal around the cap appears to have failed, or at least its not sealing as it was before. That's the weird thing.
Click to expand...

When I had the problem with the breathers there was no "woosh" or pressurizing of the tank - possibly because the pipes were not creating a complete air lock. I'd still consider it worth checking them again. Otherwise....when the dealer had the tank off did they remove the filler cap & disturb the seal / gasket? I think in the early days of Griso production there was a problem with the seal not always being installed correctly = the breather hole was not aligned with the breather pipe correctly. Maybe if they had it apart they didn't put it back right?
 
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