CNG cars have a separate fuel system that includes a CNG tank, a pressure regulator, and a fuel injector. The CNG tank stores the compressed natural gas under high pressure. When the engine needs fuel, the pressure regulator reduces the pressure of the CNG and the fuel injector sprays it into the engine's cylinders, where it is mixed with air and ignited to produce combustion and power the vehicle.
Petrol cars, on the other hand, have a fuel system that is designed for petrol. Petrol is stored in a fuel tank and is pumped through a fuel line to the engine's fuel injector. The fuel injector sprays petrol into the engine's cylinders, where it is mixed with air and ignited to produce combustion and power the vehicle.
Although it is not possible for CNG cars to run on petrol without significant modifications, some bi-fuel vehicles are available that can run on both CNG and petrol. These vehicles have two separate fuel systems and can switch between fuels depending on availability or preference.
