We did some testing and tjoldman is correct to install the thermostat before the vaporizer. We dropped the temp of the vaporizer or regulator over 20 degrees by doing so. The lower we keep the temp the lower we keep the tar content.
If you are like us if you check the number of filters you sell you will find the tech's are not changing the fuel lock filter, cleaning the last chance screen or draining the vaporizer.
According to Hendrix,Allied and several other fuel companies we checked with, anything over 140 degrees has a tendency to break the fuel back down into a liquid form.
Good luck guys
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