Gasoline bubbling in tank and leaking!! - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
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post #1 of 9 (permalink) Old 05-20-2018, 11:14 PM Thread Starter
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Gasoline bubbling in tank and leaking!!

Over time I noticed gas would find its way out of my tank through the gas cap. Recently it’s worse than ever and I can hear and feel the gas almost boiling (or bubbling) in the tank. I understand this it probably an issue with it not relieving pressure in the tank.. but the thing is I already blew out the over flow line with compressed air and that didnt do anything. I also noticed I have a rubber tube with a larger diameter that sits next to the over flow tube connected to nothing. I can provide pictures.. really don’t know what the issue is. Someone help! Thanks!!!
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post #2 of 9 (permalink) Old 05-21-2018, 06:23 AM
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Re: Gasoline bubbling in tank and leaking!!

The pressure valve in the cap could be bad. Does it only do this bubbling thing when full?

The other line is a drain. With the cap open, you'll see a hole to the left of the filler. This lets water or spilled fuel drain out. On the right side, there's another hole with a gasket. This lines up with a hole on the cap. This is the fuel tank vent.
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post #3 of 9 (permalink) Old 05-22-2018, 04:55 AM Thread Starter
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Originally Posted by TheGeek View Post
The pressure valve in the cap could be bad. Does it only do this bubbling thing when full?

The other line is a drain. With the cap open, you'll see a hole to the left of the filler. This lets water or spilled fuel drain out. On the right side, there's another hole with a gasket. This lines up with a hole on the cap. This is the fuel tank vent.
It spits out like crazy with the bike full, but you can feel the bubbling no matter what. So I’m guessing throw on a new gas cap all together, was thinking a keyless screw on. As far as the lines might as well throw on some fresh rubbers from the auto part store, while I’m at it..? lol
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post #4 of 9 (permalink) Old 05-22-2018, 07:08 AM
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Re: Gasoline bubbling in tank and leaking!!

If it's actually leaking fuel, you probably have a hole in one of the lines.
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post #5 of 9 (permalink) Old 05-22-2018, 07:57 AM Thread Starter
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Originally Posted by TheGeek View Post
If it's actually leaking fuel, you probably have a hole in one of the lines.
I mean it’s leaking from the cap itself not the over flow lines, I did forget to mention the smaller overflow line had a big gash on it 3/4s of the way down.. taped it up real good, seems alright should I replace it? Also still can’t figure out where the larger line is hooked up to.. where is the nipple for it?!?
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post #6 of 9 (permalink) Old 05-22-2018, 09:22 AM
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Re: Gasoline bubbling in tank and leaking!!

There should be 2-3 on the bottom of the tank body, plus one more for the fuel pump output.
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post #7 of 9 (permalink) Old 05-22-2018, 10:41 AM Thread Starter
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Originally Posted by TheGeek View Post
There should be 2-3 on the bottom of the tank body, plus one more for the fuel pump output.
Ok cool thanks man. I’ll check it out if I run into trouble I’ll post pictures
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post #8 of 9 (permalink) Old 05-23-2018, 04:43 AM Thread Starter
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There should be 2-3 on the bottom of the tank body, plus one more for the fuel pump output.
Lol so I figured out the problem.. I had a hose that was supposed to be connect to the air box connected to gas cap breather port, and the lose hose not connected to anything was the second breather hose.. so all I did was reverse it back to normal now I’m good. Thanks for help man. Anyone who ever runs into this stupid issue here’s some pictures.
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post #9 of 9 (permalink) Old 05-24-2018, 06:56 AM
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Re: Gasoline bubbling in tank and leaking!!

I think there's a check valve before the crankcase vent hose, but it wouldn't hurt to unscrew the oil filler cap and take a sniff, to make sure no fuel/fuel vapor has been sucked into the crank case, contaminating the oil. If the oil does smell of gasoline, you should replace it.
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