For LNG, not CNG.
They use a heavily insulated tank. You get cooling from auto-refrigeration as the vapor boils off from the liquid while you are using fuel. If you use it fast enough, you maintain the cold temperature of the fuel that was put in the tank.
You only use the vapor, not the liquid. LNG will not even ignite. You have to vaporize it, then mix with air down to a 5~15% concentration.
When you stop consuming sufficient fuel, the fuel begins to warm. As the vapor boils off, pressure in the tank will rise. Tanks are rated to contain ~5 days of boil off before they need to start venting, based upon reasonable temperature.
LNG is fine for Fleet Service vehicles that run a lot of miles and come back to a service center. You can carry more LNG energy than the same space of CNG tanks. Locomotives are starting to use LNG as well as ships.
But I think it is a bad choice for the individual. CNG makes more sense to me.
I’ve always said that I’d do a natural gas pickup if and when they became available and the infrastructure was put into place.
Did a lil research...It’s just not ready