I finally got time to get back to it, and I put a new regulator on it. Unfortunately, the case on the VFF30 cracked when I removed a fitting, but I don't feel too bad, since it was suggested that I replace it anyway-just a pain because I wanted to test it. I plugged the vacuum line and plumbed the propane direct to the regulator to test the system and it fired right up and ran nicely. It didn't do as well once it was warmed up-not sure if it is because I was running it without the lockoff or if there is something else that needs attention, but it looks like the regulator was the main issue. I'll post again once I install a new lockoff. Thanks everyone for your advice-it was spot-on!