Busa beeping like a truck in reverse??

My buddy's busa started beeping last night when we got off the expressway. He said it felt like it was riding good. We looked in the owner's manual but cant find anything about a beep?? Any ideas??
it is a fuel evap problem . mine does the same thing . the sound comes from the gas cap . if you open it it goes away . i think either the charcoal canister is plugged or the 1 way valve

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