Hello Adrienne and welcome to the forum from another Four Winds Super C owner. Yes, check to make sure the vent lines are routed near the top of the filler hose's. I never had that issue with with mine. Good luck with your Four Winds. We love ours.
Rudy, Jenny and Garrett
2014 Four Winds 35SK Super C - Ford F-550, 6.7 Power Stroke- Blue Ox tow bar with Patriot brake - 2004 CR-V, 2013 F-150 and 2016 Wrangler Sahara Toads - TST 507 tpms