When a vehicle is converted from gasoline to cng, how do you control the throttle?

Question

A gasoline engine uses a carborator or electronic fuel injection into a throttle body. How do they regulate or control the flow of fuel already in the gaseous state to control the vehicles speed, or satisfy the engines demand for fuel during accellaration? In other words, what replaces the carb or injection?

Answer 1

The manifold of an Internal Combustion Engine is almost always in a state of vacuum (unless forced induction is used)...so regulating a fuel, whether gaseous or liquid, is only a matter of jets and throttle blades.

Answer 2

Can't tell you exactly. All I know is my 1999 fuel injected Ford Crown Vic runs on natural gas and doesn't act any differently than a gasoline powered one. It has some modifications to it, of course. Bi-fuel cars used to have something called a compuvalve; maybe that's what you're thinking of. Check out my source and you'll find your answer. Like most people, I don't know HOW things work, I just know it DOES work! 85 cents a gallon gets me down the road just fine, and cleaner than anyone else, to boot.