Yes. I am thinking the regulator should not allow any fuel unless a vaccum is pulled. It has Aisan regulator. I am going to replace the regulator as it is original. Unit will start on carb cleaner but will not continue to run on LPG. Can pull hose off carb and start on spray and while running can hook line back up on LPG and unit will die. Think that diaphram is gone in regulator. The initial burst of LPG when ignition switch is turned on is possibly bad diaphram and is flooding system while attempting to start.