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CB 750 petrol tank breather [message #299850] Wed, 24 October 2018 20:35 Go to previous message
Tiger t is currently offline  Tiger t   United Kingdom
Messages: 8
Registered: October 2018
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(1) Club Racer
Hi, I have a 1996 CB 750. I would like to know what the function of the petrol tank breather is. Inside the petrol cap there are two breathers. The biggest one, I would think is for petrol overflow when the tank is too full. It's the second breather that I would like some info on. In the petrol cap, this breather is surrounded by a rubber seal, and when the petrol cap is shut, it would appear that this breather is shut off by the cap. What does this breather do.
The reason I'm asking is because the tank is leaking petrol from this breather at the underside of the tank, so it looks like the breather tube has a hole in it inside the tank.
The breather in question is the smallest of the two pipes on the bottom of the tank.
Thanks in advance for any info.
 
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