Where is the diesel engine fuel mixed with air?

The diesel engine fuel is mixed with air in the cylinder. In a diesel engine, the process begins when air is drawn into the cylinder during the intake stroke. Once the cylinder compresses the air to a high pressure and temperature during the compression stroke, the injector sprays diesel fuel directly into the cylinder. The high temperature of the compressed air causes the fuel to ignite almost instantaneously, resulting in the combustion process that powers the engine.

The other options do not accurately describe where the fuel and air mix. In the fuel tank, the fuel is stored, and no mixing occurs. The air intake manifold is where air enters the engine but does not mix with fuel for diesel engines in the same manner as with gasoline engines. The combustion chamber refers to the space within the cylinder where the combustion of fuel happens but does not accurately define the mixing process, which specifically occurs when the fuel is injected into the compressed air within the cylinder.