Ian, I always plug my fuel AND smoke together after a day of flying. I use a RED ribbon on the plugs to warn me of them before fueling. I also use the vent of the fuel or the smoke to allow access liquid to go back in the appropriate tank. This way, there is no spillage or forgetting the plugs. If I leave my jets in my van, I normally leave the window open a liitle and I release the vents to allow for heat expansion....BTW, Most of my jets are in one piece in the van hence no need to defuel in most cases.....

Just my .000001 US cents[8D]