whine from gas cap - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 05-15-2012, 09:34 AM Thread Starter
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whine from gas cap

I notice a whine form the gas cap from time to time after a longer ride. If I open and close the gas cap it usually goes away. I am guessing this is some sort of vapor leak and its causing the noise. Is thing anything to worry about or do I need a new gas cap or maybe just the seal??

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post #2 of 15 (permalink) Old 05-15-2012, 09:49 AM
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Mine was more of a "whistle"....

Think this is normal. When you stop, the heat from the motor warms up the tank and causes it.

I'd check to see your cap vents are clear just in case.....

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post #3 of 15 (permalink) Old 05-15-2012, 10:00 AM
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Quote:
Originally Posted by Knifemaker View Post
Mine was more of a "whistle"....

Think this is normal. When you stop, the heat from the motor warms up the tank and causes it.

I'd check to see your cap vents are clear just in case.....
Exactly my thoughts also...
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post #4 of 15 (permalink) Old 05-15-2012, 10:01 AM Thread Starter
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what are the cap vents and where are they?? I call it a whine but it could easily be called a whistle. We're probably talking about the same thing

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post #5 of 15 (permalink) Old 05-15-2012, 11:26 AM
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My gas cap vent is clear as is my tank vent. I still get a whine occasionally.

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post #6 of 15 (permalink) Old 05-15-2012, 11:43 AM
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I know some will not agree, but in my case the whine or whistle was a precursor for POOGS.

If it were me, I would make sure the tank vent lines are clear and also clean up the tank cap vent lines.

If you use carb cleaner in the cap, make sure it is safe for rubber. I used the wrong stuff and the rubber valve in the gas cap fell apart. I removed it and so far no ill effects and no more POOGS or whistle noise.
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post #7 of 15 (permalink) Old 05-15-2012, 08:10 PM Thread Starter
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i still need to know what and where the cap vents are

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post #8 of 15 (permalink) Old 05-15-2012, 09:00 PM
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The sound is from vacum, either negative or positive, it is normal. The louder the noise, the more the venting is blocked. I modified mine when I rebuilt it. Some pictures are in my "Stella" thread.
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post #9 of 15 (permalink) Old 05-15-2012, 09:03 PM
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The cap vents are actually inside the fuel cap asm! Open fuel cap and down at the hinge you will see 2 screws that hold the cap to the tank, in between the 2 screws you will see a little round hole with a little rubber round grommet, on the cap you will see a little stud or nipple in it with a hole , that mates to the grommet when the cap is closed. Remove the seat, find the vent tube, is on the lower left rear of tank, tube runs down and usually to in front of rear tire, pull the tube out and make sure it is not cloged, with fuel cap open, blow thru tube, you will know if it is clogged or not, if you have a Cal bike it will be the tube on the left, think it is marked with a blue dot, the back end goes to a canister under batt box. If that vent line is clear, you will need to remove fuel cap and disamble and follow the vent path to make sure it is clear. I think some one here posted pics, but was super easy, I did mine in about 20 mins! You will be amazed at just how small that vent path is in there and how easy it would be to get a clog.

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post #10 of 15 (permalink) Old 05-16-2012, 12:26 PM
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read up on POOGS here:
https://www.vn750.com/forum/showthread.php?t=17572

good detailed instructions are given there.
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