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Griso Gas Tank Connections Question

MartinDC

MartinDC

Tuned and Synch'ed
Joined
Mar 14, 2016
Messages
26
Location
Washington, DC
Out of extreme caution and to double check, does the hose in the below image connect to the rear of the gas tank? And I image the right side "stem"

I have a 2007 1100 Griso. The manual doesn't depict [with great confidence] the connections to my actual tank. My tank has two stems/outlets from the rear of the tank and pointing towards the rear; rather than pointing to the ground.

Special thanks to the poster who took this image and posted it for a different thread; not my bike; references what I'm talking about.
Thank you.
PressureValveGrisoSE_zpsc3d39b0e.jpg
 
That's just a check valve for the fuel tank vent. Goes between the tank and charcoal canister.
 
john zibell said:
The best place for that check valve is in the trash can. If you retain the vapor recovery system, just chuck the valve and use a union to replace it in the system.
Click to expand...
Since I'm a fairly new Griso owner, I have to ask why? I've been wondering about that little blue inline valve myself because mines a little noisy, sounds like a baby passing gas. I thought about removing it too. Is there any other problems with that valve?
 
Zebraranger said:
Since I'm a fairly new Griso owner, I have to ask why? I've been wondering about that little blue inline valve myself because mines a little noisy, sounds like a baby passing gas. I thought about removing it too. Is there any other problems with that valve?
Click to expand...


They often fail preventing air entering the tank. You end up with a vacuum situation overworking the fuel pump. If you hear a whoosh sound when you open the fuel cap, then it isn't working as it should.
 
john zibell said:
They often fail preventing air entering the tank. You end up with a vacuum situation overworking the fuel pump. If you hear a whoosh sound when you open the fuel cap, then it isn't working as it should.
Click to expand...
Then that baby is coming out. Its been making that whoosh noise since day one with 2 miles on the OD. I didn't think it was right and I thought that valve might be the reason why. Thanks for the info.
 
The small woosh is normal as is the noise with the valve in place. The tank only vents when the pressure from sitting hits a certain value. It then burps out some vapour and reseals. Same happens in reverse when air is taken in.

It is when it is a big whoosh or gas comes streaming out of your tank that you have an issue. I actually put my valve back in but located it in a place that is easily accessible (on the Stelvio it is under the tank which I believe was the real problem with all the heat there). There was also a rash of backwards installed valves. If it is installed correctly, it should cause no issues. I was tired of the smell of gas and loosing fuel from evaporation in a hot garage. My experience is that it has worked flawlessly at least without the canister in place.
 
My woosh isn't that small, it can be rather abrupt sometimes when opening the gas cap. Fuel doesn't shoot out, but I'm in Florida where it gets pretty hot most of the year. If its doing this in mild Florida winter temps in the 70's, I can only imagine what it will be like in the upper 90's during the summer. I don't think the valve is bleeding enough pressure from the tank. None of my other bikes had this much back pressure in the tanks, including the 2013 Triumph Trophy.
 
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