When running on propane, the fridge flame is barely larger than that of a pilot light. Depending on the length of line beyond a higher-volume-using appliance like the range, it may take several failed attempts to purge the air from that last run of line, as you have now learned.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam
Self restraint is for the young. I'm old and want it NOW!