From what I have read in various places, cars and FLT's draw liquid into a separate evaporator, to allow the liquid to boil off into a gas, before they use the gas in the engine. So these tanks have tube which dip down into the liquid. I also read that FLT bottles are marked with an arrow, for the correct orientation for when mounting them on a FLT.
I suspect that when a car or FLT runs low on liquid and the pickup pipe uncovered, they will simply carry on running on the gas remaining, but the power would be way down?
I have no experience of a Ford Focus running on LPG so, I can't comment on that although, I'd imagine that it has a different system to a fork lift with a cylinder strapped onto the back of it.
The cylinder shown in John's link has a black shoulder, that shows that it is different from a normal propane cylinder.
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