...what Newfie said, X2.
Good fuel which does NOT include the Ronson crap you can get at the grocery store, and purging the tank of your lighter every time you get ready to refill it seem to do the trick. I use a small screwdriver blade to depress the fill valve and fully empty the tank prior to refills. 'Bout all it takes to keep them running happy.... :thumbs:
Cheers - B.B.S.