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After a ride in warm weather, there's a whining noise coming from my '91 Interstate. After checking electrical components, I found the noise to be coming from the gas cap. When opened, it sounds like opening a fresh can of coffee and the sound is gone. I'm wondering if the fuel cap gasket is bad or do they normally make this noise? Also, accelerating from a stop, the engine hesitates. Vapor lock?

Thanks in advance,
Rick:wtf:
 

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Junior Grue
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The venting is normal although not usually audible while riding.

You could open the throttle more to use the fuel faster than it can expand and vent.:ROFL:
 

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It aint rocket science
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After a ride in warm weather, there's a whining noise coming from my '91 Interstate. After checking electrical components, I found the noise to be coming from the gas cap. When opened, it sounds like opening a fresh can of coffee and the sound is gone. I'm wondering if the fuel cap gasket is bad or do they normally make this noise? Also, accelerating from a stop, the engine hesitates. Vapor lock?
Your bike is designed to run with a pressure in the tank from fuel vapors. It will give a whoosh sound when opening.

A hesitation will normally point to carb work that needs attention.
 

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The venting is normal although not usually audible while riding.
The venting is normal. Although it's not suppose to be audible under any circumstances. I'd replace the cap if it's in the budget.
A cap that's causing vapor lock will take some time to have any effect, and it wouldn't just be at idle. As stated, possible carb work necessary. A whooshing sound when removing the gas cap is not abnormal.
 
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