We learn by experience (if we live to tell the story). Yes, I too have been guilty of not checking fuel vents on a Rockwell Commander.....same result FTDK. Fuel starvation enroute Canberra to Port Macquarie (during winter). My guardian angel got me into Scone where i found.....yep you guessed it, mud from a wasp nest. From that day after I check vents methodically on the daily. Sometimes the older and more experienced we get the more complacent we become. The coughing and spluttering soon had me dropping the coffee and grabbing switches.