jedibiker Posted March 21, 2023 Share Posted March 21, 2023 Hey all. So my fuel tank keeps letting out a little whine as if the pressure has built up. Yesterday had the tank up and check the drain and breather pipe which are fine and not getting caught. My old bike never did it, nor does my wifes. i cant seem to figure out how pressure is still building up. Quote Link to comment Share on other sites More sharing options...
Copycat73 Posted March 21, 2023 Share Posted March 21, 2023 bet its a Yamaha. Quote Link to comment Share on other sites More sharing options...
jedibiker Posted March 21, 2023 Author Share Posted March 21, 2023 kawasaki Quote Link to comment Share on other sites More sharing options...
Old-codger Posted March 21, 2023 Share Posted March 21, 2023 If the bike is fuel injected could it be the tank is pressurised by the system and what you are hearing is as you stop the engine the pressure is vented. Quote Link to comment Share on other sites More sharing options...
jedibiker Posted March 21, 2023 Author Share Posted March 21, 2023 19 minutes ago, Old-codger said: If the bike is fuel injected could it be the tank is pressurised by the system and what you are hearing is as you stop the engine the pressure is vented. it lives inside and sometimes if the kitchen gets warm it will set it off,. also did it when got home from a ride sunday. runs fine i just didnt want to ignore it if fumes are struggling to vent Quote Link to comment Share on other sites More sharing options...
Stu Posted March 21, 2023 Share Posted March 21, 2023 Does sound like a clogged breather! After a long run stop and open the tank and see if you get a woosh of air in to the tank It could be early signs of a blocked breather which could give you a headache later on I'm not sure on this but do some bikes have a one way breather that would only allow it to vent at a set pressure? that would cause the noise too 1 Quote Link to comment Share on other sites More sharing options...
jedibiker Posted March 22, 2023 Author Share Posted March 22, 2023 10 hours ago, Stu said: Does sound like a clogged breather! After a long run stop and open the tank and see if you get a woosh of air in to the tank It could be early signs of a blocked breather which could give you a headache later on I'm not sure on this but do some bikes have a one way breather that would only allow it to vent at a set pressure? that would cause the noise too the breather pipe is ok but im now thinking its blocked inside somewhere. Quote Link to comment Share on other sites More sharing options...
Stu Posted March 22, 2023 Share Posted March 22, 2023 33 minutes ago, jedibiker said: the breather pipe is ok but im now thinking its blocked inside somewhere. Just bear in mind that the breather that runs to under the bike may well just be an overflow pipe and not a breather Some breathers are built in to the lock cap Quote Link to comment Share on other sites More sharing options...
jedibiker Posted March 22, 2023 Author Share Posted March 22, 2023 2 minutes ago, Stu said: Just bear in mind that the breather that runs to under the bike may well just be an overflow pipe and not a breather Some breathers are built in to the lock cap yeah theres 2, one is under and goes down which is the drain, the other goes to the back and is breather, managed to find a diagram to trace the holes. knew one was drain as had a bit of rust. going to see if i can push some air through the breather hole under cap.. but like you said it could be a valve anyway so il not force it 1 Quote Link to comment Share on other sites More sharing options...
Ronnie Posted March 22, 2023 Share Posted March 22, 2023 On 21/03/2023 at 14:28, jedibiker said: My old bike never did it, nor does my wifes. i cant seem to figure out how pressure is still building up. My wife never whines either. 1 1 Quote Link to comment Share on other sites More sharing options...
Tinkicker Posted March 24, 2023 Share Posted March 24, 2023 If your bike has an evap system and not just a straight forward breather, it may be that the carbon canister needs replacing. Quote Link to comment Share on other sites More sharing options...
V650 Posted March 26, 2023 Share Posted March 26, 2023 My Kawasaki also does this I Believe there is a little vent hole in the cap keep meaning to remove it and have a look just have not had the time lately 1 Quote Link to comment Share on other sites More sharing options...
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