Ridemalibu Motorcycle Rentals & Tours – Los Angeles CA
  1. Ciao Guest - You’ve landed at the ultimate Guzzi site. In SoCal? See the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have are already answered on the Forum with FACTS, NOT OPINIONS. PLEASE DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back if you are posting elsewhere on the web. Note there's decades of Guzzi hands-on experienced help on this site, all whom give endless amounts of their time for free; BE COURTEOUS AND RESPECTFUL! There is zero tolerance on personal attacks and off-site links to other Forums or competing products. Also be sure to click on the STORE link also above for our 600+ product inventory, including many of our 100% Made-in-house-USA GTM products and engine kits. We appreciate the consideration, understanding and your business... past and future. And if you haven't seen our MotoCycle (not) art, click on the BUILDS tab above to see our work at our sister business; GT MotoCycles®-- WE ARE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED.

Fuel tank breather/EVAP system

Discussion in 'Loop & Tonti' started by Hydrolastic, Jun 23, 2020.

  1. Hydrolastic

    Hydrolastic Tuned and Synch'ed GT Contributor

    Joined:
    May 25, 2020
    Messages:
    55
    Likes Received:
    15
    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
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Joined:
    Oct 28, 2008
    Messages:
    8,041
    Likes Received:
    869
    Location:
    Huntsville, AL
    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.
     
  3. Hydrolastic

    Hydrolastic Tuned and Synch'ed GT Contributor

    Joined:
    May 25, 2020
    Messages:
    55
    Likes Received:
    15
    Location:
    Pacific NW
    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
     
  4. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Joined:
    Oct 28, 2008
    Messages:
    8,041
    Likes Received:
    869
    Location:
    Huntsville, AL
    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.
     
  5. Hydrolastic

    Hydrolastic Tuned and Synch'ed GT Contributor

    Joined:
    May 25, 2020
    Messages:
    55
    Likes Received:
    15
    Location:
    Pacific NW
    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.
     
    john zibell likes this.
  6. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Joined:
    Oct 28, 2008
    Messages:
    8,041
    Likes Received:
    869
    Location:
    Huntsville, AL
    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.
     

Share This Page