In message , Andy
Burns writes
bert wrote:

To be vaporised externally i.e. in the regulator/vaporiser heat will be
withdrawn from the surrounding environment.
In automotive applications this heat is supplied by running the engine
coolant through the vaporiser. Some systems had a temperature sensor so
that the engine did not switch to LPG until a suitable temperature had
been reached otherwise it would freeze up the regulator. I believe the
original comment was correct. The tanks on fork lift trucks are vapour
takeoff.

Or are there two types in use? The collar on the tank is clearly
marked "liquid offtake only" in the video Colin linked to.


There are certainly the two types of tank Generally vapour take off on
small (air cooled) engines liquid on larger engines (water cooled).
There are also single hole tanks and 4-hole tanks.
If it says liquid take off only on the tin that is what it will be.
It's a while since I was involved with LPG conversions so the memory is
getting a bit vague. However after a bit of googling I find reference
eventually to instructions for refilling liquid take-off 29KG LPG
cylinders and fixed tanks for Fork Lift Trucks from Calor.

--
bert