I have had recent problems with loosing my prime (no remarks please) on my 8V92T over a couple days parked. We repaired the check valve in the Primary Fuel Filter/Water Seperator which was fouled with all kinds of gunk, and to be on the safe side, I now close my fuel shut off valve which is located right below my 24 & 12 volt Battery Disconnect switches in the Right Side eng bay. Would love to know more about this air/prime capability just in case. I watched Jacksonville Prevost mech prime my engine at their facility, and know that I do not want to manually have to EVER do this.