Due to the laws of thermodynamics, it does not have to be cold outside for the LPG regulator to freeze.
The fuel itself has to warm up as the gas expands, and pressure changes, this is the reason for waterlines that lead into and away from the LPG regulator.
Are you filling the tank from a gravity fill tank?, are you filling it when it is cold outside, then keeping the tank and truck inside the rest of the day?
Has anyone (that knows what they are doing) drained the regulator to see if it is filled with residue?
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