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Fuel Tank Pimples

Discussion in 'Griso-Bella Chat & Tech' started by PJA0916, Dec 22, 2014.

  1. PJA0916

    PJA0916 Just got it firing! GT Famiglia

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    I have a 2013 Griso with the black and silver paint and sticker job. Maybe people with older Griso's may have had this problem. What can be best described as pimples are showing up in the silver paint. They can barely be felt on the paint surface if at all. It would be as if circular flush rivets were used to assemble a metal tank and the edges of the rivet started showing through the paint. They are all circular, are showing up in random places and are increasing in number. I would try to post a photo, but they are very difficult to see in pictures because they only show up on the silver. And if this was not bad enough one of the black stickers is starting to bubble up and will not stay attached to the tank. My dealer has sent photo's and a description of the problem to the Piaggio group to see if they will replace the tank since the bike is still under warranty. I have looked at 2014 models and have not seen the problem, but it did take about a year for the defect to start showing up on my tank. And I thought after going through 6 tanks on my Ducati that I would escape fuel tank problems with this bike. So has anybody else experienced this on their Griso? Please, no jokes about my tank starting to look like the face of a teenager!
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    It is a tank issue. It has happened to others. If you search the forum you will see there have been other cases. It sounds like the dealer is doing what he should.
     
  3. PJA0916

    PJA0916 Just got it firing! GT Famiglia

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    The dealer is doing a good job, my fear is that Moto Guzzi will not replace the tank. The dealer had similar problems with Aprilia fuel tanks and the Piaggio group would not authorize tank replacements in those cases. I wanted to see if anyone else was able to get a new tank.
     
  4. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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  5. wildgeezer

    wildgeezer Just got it firing!

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    My black 07 had them when I bought it. I personally think it's caused by ethinol in the fuel. I bought a new tank from F1 and now I won't run anything but non ethinol. They haven't reappeared in a year now. Knock on wood they won't again.
     
  6. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    My black 07 (bought in 06, first one sold in Md) has no pimples and only runs on ethanol fuel.
    General consensus is ethanol is to blame, but it is odd that yours would with some exposure to ethanol and mine, which due to Md law, always runs ethanol has no issues. Seems there are other factors involved beyond whether or not the fuel has ethanol in it.
     
    Stevie likes this.
  7. abbienormal

    abbienormal High Miler GT Famiglia

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    A friend had a KTM 990 Adventure and the decals on the tank all bubbled and started some peeling, Consensus was ethanol. KTM said the next one will probably do it also if you don't coat the tank. He sold the bike but bought another KTM. Must be like owning a Guzzi.
    A lot of people with vintage fiberglass tanks that the ethanol eats use Caswell tank sealer. A friend just used it to to seal a rusty tank on his TS185 and it worked great plus it is supposedly unaffected by ethanol.
    http://www.caswellplating.com/restoration-aids/epoxy-gas-tank-sealer.html
     
  8. Resom

    Resom Just got it firing!

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    I have a 2014 Griso (Black/Silver)... My bike is 17 months old with 10,000 miles on the clock. My tank is starting to develop "bumps" too. This sucks! I've experienced this "tank swelling" with Ducati's and MV's also.....what a nightmare! I have had a total of 3 tanks replaced by those manufacturers. MV actually has "new" tanks that don't swell... I guess Acerbes finally came up with a plastic formula that ethanol doesn't attack.

    Anyway, was your problem resolved by Guzzi?
     

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