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Originally Posted by BlackGold6.4
I remember them installing a vaporizer with different spark plugs and bunch of work but mostly saving huge on fuel because I was a courier driver back then.
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There is no vaporizer for CNG, as it's already stored at vapor phase, yet often there is a pressure reducer because it's stored around 3000-3600 PSI, while propane is stored at a much lower pressure (which I don't remember right now but it's noticeably lower). However, while pressurized, propane is at liquid phase, so when it's either left to de-pressurize or heated (through a heat exchanger connected to the coolant circuit, after the vehicle having been started on gasoline) it switches to vapour phase.
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I wouldn't mind if you explained the difference between CNG and the others so it can clear the mud in my mind.
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CNG main component is methane.