A vehicle CNG kit lets a suitable petrol engine run on compressed natural gas while retaining petrol operation in a typical bi-fuel installation. The system stores CNG in a certified cylinder, controls its pressure and meters the fuel into the engine according to the vehicle and kit design.
This guide explains product and selection principles. It does not confirm compatibility, replace model-specific documents or provide a repair procedure.
From cylinder to engine
CNG travels from the cylinder through high-pressure lines to a reducer, which lowers the pressure to a level the engine can use. Filters, valves and shut-off devices manage the flow, while injectors or a mixer deliver gas to the intake system.
How electronic control works
In a sequential kit, a gas ECU reads relevant engine signals and calculates injection timing for each cylinder. Calibration is vehicle-specific: a well-matched system should switch fuels smoothly and maintain appropriate air-fuel control without relying on one setting for every model.
Installation and operation
Cylinder mounting, pipe routing, wiring, leak checks and calibration should be completed by a trained installer using compatible components. Owners should follow the applicable approval, inspection and registration process in their jurisdiction and have the system checked if they notice odour, difficult starting or uneven running.
Frequently asked questions
How does CNG travel from the cylinder to the engine?
CNG passes through pressure-rated lines and valves to a reducer, which lowers its pressure before injectors or a mixer meter the gas into the intake system.
What does the gas ECU do in a Sequential CNG kit?
It reads relevant engine signals and uses the vehicle-specific calibration to command gas delivery for the individual cylinders.
Can the same CNG components and calibration be used on every car?
No. The engine, injection system, emission generation and approved application determine the required system, hardware and calibration.