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Fuel tank breather/EVAP system

Hydrolastic

Cruisin' Guzzisti
GT Contributor
Joined
May 25, 2020
Messages
105
Location
Pacific NW
Does anyone have photos of a 2003+ fuel tank breather setup the rest of the world (outside USA/CAN)? The setup I have now seems like it would set up a siphon effect in some circumstances. Also, regarding the EVAP system, is it the rollover valve that tends to fail and prevents proper venting, or something within the canister that plugs up?

Dave
 
Dave, the best thing to do with the tip over valve is to just remove it and throw it in the trash. A search of the forum will show it to you. Also removing all the evap stuff wouldn't hurt.
 
John - it has all been removed, but since there is a different part number for US and ROW tanks, I wanted to see what the setup was for non-US systems. My older motorcycles all had vented gas caps, similar to many cars prior to 1970, but the gas cap is the same part number for all markets in this case. The last time I filled up, I had gas dripping onto the left side exhaust, which is undesirable, so I want to make sure it is set up to prevent any sort of siphon effect on the side stand.

Additionally, I was curious as to what part of the system fails and causes issues. Automotive evap systems have been around now for 40 years with hardly any problems. The only failures I have seen have been either crushed or plugged lines to the tank (rusted fittings, etc.), or liquid somehow getting into the charcoal bed through misrouted lines or something like that. I'm inclined to think the rollover valve is the culprit, but I wanted to see if anyone had been into a few of these failures a little further.

Dave
 
The tip over valve is the culprit. It becomes blocked and doesn't allow air into the tank. Just run a hose long enough to prevent any dripping onto the bike. I've run with just a short stub of a hose on tank vent attachment point with no issues an all my Tonti bikes. If you filled the tank then put it on the side stand, then I can see where it might drip but I've never done that. I've always placed on center stand for a fill and after filling if i didn't immediately ride some distance.
 
That makes sense, too bad after all this time that no one felt the need to fix the problem and Guzzi just keeps re-using defective engineering. Yep, I would put mine on the center stand if I had one. Guzzi decided the Titanium should have that as optional vs. standard. I have a kit hopefully arriving soon.
 
That makes sense, too bad after all this time that no one felt the need to fix the problem and Guzzi just keeps re-using defective engineering. Yep, I would put mine on the center stand if I had one. Guzzi decided the Titanium should have that as optional vs. standard. I have a kit hopefully arriving soon.

Kind of like they did with the Jackal. Just something to save production cost, then they can sell the kit. Good to hear you have the center stand kit coming. They have become scarce.
 
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