By Herb de la Porte when I first got my car, it was equipped with a propane setup. It allowed for the vaporizer tube to be removed and one of the holes to be used to hold a sparking unit. the sparking unit would be on all the time, which caused an annoying rhythmic ticking sound whenever the pilot was lit. On the plus side, It seemed to work well. Unfortunately, propane pilots seem to have fallen out of favor in the US and that, combined with a system that had a lot of fire damage, led me to fabricate a vaporizer tube and convert the pilot back to Hexane, with all similar results that you're experiencing. The addition of the tube took away any easy option to place thermcopiles or spark generators close to the flame. Don Bourdon has a little shield he sells that may be worth trying. In my case, I have mounted the license plate on a hinge in front of the boiler so when it's down, it somewhat covers the flow of air and that seems to help somewhat but I'm still dealing with frequent blow-outs
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