Starts, fires but won't keep lit.

Question

I have a All Pro SPC K100 that worked great and then tonight, started and lit about half way but then went out and smoked!! I just purchased this used and have tired it few times no problem. I have took the filter out and washed it and will let it dry. I put new fuel in hopeing that helps. I have no book to guide me for trouble shooting. It will run but no heat and then will shut off. I have no idea where to stary. I notice when i took the filter panel off, that it had a couple k***s and a air port stating so much psi but i have no clue what that is all about. Any help would be great. Thanks ken