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How Do Liquefied Natural Gas Trucks Work?

Heavy-duty liquefied natural gas (LNG) vehicles work
Much like gasoline-powered vehicles with a spark-ignited internal combustion engine. The natural gas is super-cooled and cryogenically stored in liquid form,
Usually in a tank on the side of the truck. LNG is typically a more expensive option than compressed natural gas (CNG)
And is most often used in heavy-duty vehicles to meet long-range requirements.
Because it is a liquid, the energy density of LNG is greater than CNG,
So, more fuel can be stored onboard the vehicle.
This makes LNG well-suited for Class 7 and 8 trucks traveling greater distances.

Key Components of a Liquefied Natural Gas Truck


The battery provides electricity to start the engine and
Power vehicle electronics/accessories.

Also, read – How Do Propane Vehicles Work?

Electronic control module (ECM):

The ECM controls the fuel mixture, ignition timing,
And emissions system; monitors the operation of the vehicle;
Safeguards the engine from abuse,
And detects and troubleshoots problems.

Exhaust system:

The exhaust system channels the exhaust gases from the engine out through the tailpipe. A three-way catalyst is designed to reduce engine-out emissions
Within the exhaust system.

Fuel filler:

A nozzle from a high-pressure hydrogen dispenser attaches to;
The receptacle on the vehicle to fill the tank.

Also, read – How car electrical systems work

Fuel injection system:

This system introduces fuel into the engine’s combustion chambers for ignition.

Also, read – Common Spark Plug Misfire Symptoms

Fuel line:

A metal tube or flexible hose (or a combination of these)
Transfers fuel from the tank to the engine’s fuel injection system.

Fuel tank (liquefied natural gas):

Stores liquefied natural gas on board the vehicle until it’s needed by the engine.

Internal combustion engine (spark-ignited):

In this configuration, fuel is injected into either the intake manifold
Or the combustion chamber,
Where it is combined with air,
And the air/fuel mixture is ignited by the spark from a spark plug.


The transmission transfers mechanical power from the engine,
And/or electric traction motor to drive the wheels.

See more:

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