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I'm not sure if the noises some hear ONLY occur while filling up the tank or when driving around. Mine never "howled" but it does make a "bubbling" sound as the fuel tank fills close to full. I just always assumed it was just air bubbles trapped and being released.
IF I stop filling the fuel when the pump first clicks off the fuel gauge (in the instrument cluster) will show almost a 1/8 tank low....so I typically pump a little more in. BUT I KNOW there's a point at which too much fuel will mess with the vapor recovery system. It's a fine line.
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98' Boxster
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