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Griso fuel tank pressurized

grisogreg

grisogreg

Just got it firing!
Joined
Aug 6, 2012
Messages
15
OK, something's not right and I figured I'd run it by a few here to see of there's a quick answer before I actually have to start using my search skills or making phone calls.

This weekend was my first long ride on the Griso. Early in the morning doing pre-flight, I open the gas cap which was a bit stuck. I lifted the cap with a good bit of force and a huge sucking sound and a mist of gas and fumes came out. Glad I was wearing glasses. This was while the bike was stone cold, parked in my garage for a week.

And hour into my ride, stopped for fuel, same thing.

Got home later that day, parked the bike and a buddy came over say 30 min later after I parked. I was telling him about the issue, we went to the bike opened the gas cap to the same vacuum, peered down in the tank and the fuel looked as a pot of water does just before it goes into a boil, ripples all along the top. I put my finger in, the fuel was very warm and the rim of the tank opening was very warm, hot even.

I've got the bike parked in the garage with the fuel cap not quite locked so it'll vent.

OK, if I can plead ignorance from the get-go, where do I start?
 
A search would have revealed to get rid of the tip over valve. It is in the vent line and can prevent proper venting of the fuel tank. Also check under the tank to see if any of the lines are pinched.
 
john zibell said:
A search would have revealed to get rid of the tip over valve. It is in the vent line and can prevent proper venting of the fuel tank. Also check under the tank to see if any of the lines are pinched.
Click to expand...

Thanks John. The tipover valve is the culprit then. This bike was bought as an insurance salvage, so I can be sure it's spent a little time tipped over in it's short life.
 
I have found a few with blocked breathers, not actually the hoses but in the tank orifices. Generally a pressure clean out is all that is needed
 
Pinched line wouldn't be a rare thing either, like John said.
Check those first.

My transmission breather hose was pinched between the tank and frame, from the factory...
That means I did the break-in period under pressure on my bike. Not good.
When I undid the drain plug the first time it literally blew out of my fingers and in the drain pan it went.
Freaked the shit out of me!! I knew some was wrong so I followed the hose and found out it was pinched.
Too much Grappa at the factory I tell you...
 
I had the same issue, and it was just gunk in the tube, which after removing, blowing out with a compressor the problem was resolved.... on one ride and a whole tank of gas used I thought the tank must have been close to imploding... I saw the tank release back to shape when lid was opened. There are two hoses at the rear of the tank linked together to come out under the motor.
 
John Zibell
"A search would have revealed to get rid of the tip over valve. It is in the vent line and can prevent proper venting of the fuel tank. Also check under the tank to see if any of the lines are pinched."
Click to expand...

John,
Any useful advice/pics re removal of the tip-over valve would be appreciated.
 
I don't have pictures. Start by looking at the parts manual. You should be able to judge it's relative position from the illustration.
 
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