Buzzing sound ?

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Joined
Mar 29, 2007
Threads
10
Messages
40
Location
Maine
Went into my garage this am and heard a buzzing sound. It was coming from my new 21he. The sound was coming from the rear underside. I started the lc and turned off and buzz went away. Could this have been the fuel pump?
 
It runs about four to eight hours after power off. This Toyota system uses the same evap tech across almost their entire lineup
 
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