Thanks for that info Jplayer! I checked the shut off solenoid previously when it was completely off of the system by blowing through it with my mouth when energized and it opened fine and closed fine when I de-energized it. I was pretty sure that vaporizer should flow lp no with out a vacuum source.

I was hoping it was something with the vaporizer allowing coolant through. I ordered a new "cobra" style vaporizer for it. Also the mixer is toast. The diaphragm looked to be in good condition but 2 of the 4 bolts on the bottom cover broke when disassembling it, plus the butterfly is quite rusty, and there was a lot of crap built up in it.

Its a ca-100 mixer. I am not sure if there are any different models or variations but I need to find one now. I found a few on ebay from 65-200.