Ditto the symptom. We too, noticed it when stopping with a full tank. It starts coming in the air vents. It started just two trips ago. I noticed the fuel on the frame and cap, but couldn't find any leak at the hose, or the underside of the fiberglass bulkhead that holds the filler. However, the fuel seemed to be coming back up around the fuel cap. I'm going to get a new one tomorrow (found spec on earlier thread). If that doesn't work, I'll re-investigate that vent hose. Thanks alpine4us!
2003 Alpine 40FDTS (400HP)
Long Beach, CA