So as I was cruising down the highway today, after filling up the tank, the truck would seem to be running fine however when i got up to speed (about 45) it would start to die on me. It did not do this earlier before i filled it up. It even went so far as to die on me at a stop light. I pulled it off the side of the road, looked inside and noticed that the little round thing that the fuel line plugs into, then goes into the mixer, the one that has the vacuum line on it was all frosted over. So I thought that maybe i had too much propane flowing to it, i went in the back to the tank and closed the valve almost all the way, just enough to not kill the truck. Drove it home with no issues. Was that the fix for it? Or was it something else that I did not see?