CNG = Compressed Natural Gas. It's not liquid in the tank, where in the injection process do you think it becomes liquid?
Never. Especially since there is no tank or regulator included, there is no way to run LNG (Liquified Natural Gas), and you need cryogenics to install it.
BTW, most CNG applications are about 3000 psi. This is not your backyard BBQ propane tank we are talking about. From wiki....
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CNG's volumetric energy density is estimated to be 42% of liquefied natural gas's (because it is not liquefied), and 25% of diesel's.[4]
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