Replace the other vent valve in the engine compartment. I think it is called Purge or regeneration valve?
http://forums.rennlist.com/rennforums/996-forum/773261-humming-noise-near-gas-cap.html
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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