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Bikes, Hints'n'Tips => Fazer 1000/FZ1 corner => Topic started by: binarystarr on 11 April 2012, 01:35:51 pm

Title: Fuel tank breather hose leak
Post by: binarystarr on 11 April 2012, 01:35:51 pm

Hi all


Just noticed fuel is dripping from the fuel tank breather hose.


Any ideas as to what could be causing that?

Title: Re: Fuel tank breather hose leak
Post by: Falcon 269 on 11 April 2012, 01:46:33 pm

You sure it's the tank breather hose and not the carb overflows?

If the latter, suspect sticking float (fairly significant outflow, though), a leaky float needle (not common) or a leaky float needle seat O-ring (a lot more common).

http://www.yamahafz1oa.com/forum/showthread.php?t=103599&highlight=found+carb+failure+mode (http://www.yamahafz1oa.com/forum/showthread.php?t=103599&highlight=found+carb+failure+mode)

Title: Re: Fuel tank breather hose leak
Post by: Phil TK on 11 April 2012, 02:10:12 pm

Quote from: Falcon 269 on 11 April 2012, 01:46:33 pm

If the latter, suspect sticking float (fairly significant outflow, though),

My FJ suffered from that until I got the carbs out and cleaned the bowls and float pivot -and replaced o rings and needle jets. However a temporary cure that often worked was to whack the errant carb bowl a few times with the end of a wooden hammer handle.

Title: Re: Fuel tank breather hose leak
Post by: locksmith on 11 April 2012, 03:02:04 pm

I concur, a couple of sharp taps on the carb bowl can be effective.

Title: Re: Fuel tank breather hose leak
Post by: binarystarr on 12 April 2012, 10:28:53 am

Many thanks guys, haynes manual arrived today so will be out this weekend with the tool kit.


I suspect i may have possibly overfilled the tank but this is a good excuse to get my hands dirty and check a few things over.

Title: Re: Fuel tank breather hose leak
Post by: taksi on 12 April 2012, 08:53:41 pm

My injected '08 FZ1 does it as well in the sun. No carbs to bash so any other ideas?
 
Taksi

Title: Re: Fuel tank breather hose leak
Post by: Falcon 269 on 12 April 2012, 09:57:03 pm

Just a wild guess ... too much fuel, expanding when it gets warm?

Title: Re: Fuel tank breather hose leak
Post by: binarystarr on 13 April 2012, 04:04:59 pm

Falcon, i think thats more than likely the problem. Only thing is it didn't leak until several days after filling. I guess it may take a while for it to condense and make its way down the tube.


I'm not too worried. Will keep an eye on it and get greasy in the meantime.

Title: Re: Fuel tank breather hose leak
Post by: Falcon 269 on 13 April 2012, 10:23:10 pm

Leaking due to overfilling/expansion would normally be immediate to my mind.

Has it been raining on the bike recently?  I wonder if you've had water get around the tank cap and find it's way out via the overflow hose.