My Microquiet 4000 needs primed after just a couple of days "sitting". Gotta admit I didn't even know I could prime it from inside the coach until I read it on the forum some time ago. (Hmmmm maybe I really should read the manual.) Mine seems to have about a 5-second delay so I hold the switch in the "Off" position for about 20 seconds to prime. Now it usually starts on the first or second attempt.....but I never hold the starter engaged for more than 4 or 5 seconds then a 30 second rest. (I recall that being described as a "pulse start" technique by at least one poster in the past.) Checking the automatic choke is on my "to do " list.