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 Fuel Cap Leak Overflow

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airbornebaby
Carlotto
Carlotto
airbornebaby

Posts : 32
Join date : 2017-06-27
Age : 44

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PostSubject: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Thu Apr 08, 2021 5:59 pm

Hi from Canada,

I just did my first ride of the year on my GRiSO. Had a blast until I got home and had the fuel treatment that had been used for winter storage overflow through the fuel cap. Check out the mess below. Nothing like this has happened before. I had noticed over the years some squealing in the tank and figured there was some over pressurization but didn't think much of it. Today I noticed some leakage as the bike was stopped and the tank had more fuel but later in the day when it was low was when it really came out. I've worked on Japanese bikes but have hardly gotten my hands dirty on my GRiSO. Any advice on where to start looking? Thank you and happy riding!

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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

Posts : 5143
Join date : 2014-03-13
Age : 66

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PostSubject: Re: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Thu Apr 08, 2021 6:42 pm

There should be two drains under the filler cap - one is for water ingress around the cap, the other is for overflow of fuel. looks like the fuel treatment and the agitation caused by riding are a dynamic mix. Maybe next time, drain the tank instead of fuel treatment.

These drains are easy to clean, though you will have to remove the tank. These have been known to get blocked with normal crud (as distinct from abnormal crud). I have had to drill my nipple out where the drain hose attached. I used a very small drill < 0.5 mm in dia.
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

Posts : 8090
Join date : 2013-05-29
Age : 64

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PostSubject: Re: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Thu Apr 08, 2021 7:41 pm

And don't push it in to far or you will hole the tank!
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lcjohnny
GRiSO Capo
GRiSO Capo
lcjohnny

Posts : 398
Join date : 2016-01-25
Age : 66

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PostSubject: Re: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Fri Apr 09, 2021 2:42 am

The hoses from both drains run a very tight curve in front of the frame tube before dropping down - easy to fold them and block them on re-assembly
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Red Leader
Carlotto
Carlotto
Red Leader

Posts : 48
Join date : 2017-04-24

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PostSubject: Re: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Fri Apr 09, 2021 5:50 am

Hi Folks,
I stick a bit of white vinegar down the drain hole whenever I remember to & it does the trick.

Over lockdown it clogged up again... I couldn't face taking the tank off in the cold. I stuck a drinking straw down the hole & gave it some puff & that worked fine. The straw was an exact fit & can be pushed in about 2" or thereabouts so is now my new "go to" solution.

Had the tank off last week, though..... new clutch switch!!!

Cheers to everyone.....

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airbornebaby
Carlotto
Carlotto
airbornebaby

Posts : 32
Join date : 2017-06-27
Age : 44

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PostSubject: Re: Fuel Cap Leak Overflow   Fuel Cap Leak Overflow Icon_minitime1Fri Apr 09, 2021 1:03 pm

Thank you all! I really appreciate it. I just found out what that fluid was, it wasn't fuel stabilizer. It was gearbox oil that got into the fuel/engine line. In checking the gearbox level after having some shifting issues a ton of fuel/gearbox oil came out, just as through the fuel cap. I'll put up another post with pictures to find out how this could ever happen. Last year a dealer re-threaded the gearbox drain plug. Could they have somehow drilled too far and caused this? What a mess.
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