My only guess is it may have a vent that closes when liquid enters it. A vent normally will just let gas come out if you overfill it, but I don't know if new vents may close off when liquid enters them to prevent fuel spillage. All of my past boats would just push gas out the vent if they were overfilled.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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