"Clunking" Sound Coming From Rear (Gas?)

O__O

Well-Known Member
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This is going to come off sounding extremely "noobish", I know - but I'm getting tired of it.

From day 1 with my 2013 Si sedan, whenever I come to a normal speed stop, I can hear several "clunks" coming from the rear. The sound is as if the gas is sloshing back forth several times and then comes to a rest. It happens whether the gas tank is full or nearly empty. I've personally owned 4 other cars and I've never heard anything like this. Maybe this is normal and it's just that the Civic doesn't have a lot of sound dampening down by the gas tank?
 
I am not sure , but I think it is because the tank is plastic. Louder at some levels of fullness.
 
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