Do not use any pipe dope or Teflon tape on flare fitting!
Turn off the propane source.
Disconnect the fitting.
Inspect the fitting for any burrs, normally on the flare.
Clean the flare with fine steel wool.
Wipe bothe the flare and the fitting in gas valve with alcohol.
Re-connect. Turn on propane and check for leak.
If leak is present, get some pprofessional assistance!
Bud
USAF Retired
Pace Arrow
2003 Chev Ice Road Tracker