Correct answer
The feed pump.
The feed pump. It supplies fuel to the injection section; high-pressure generation and metering depend on the installed system. Injectors introduce fuel into the cylinder. During diesel compression the piston compresses air, not an air-and-fuel mixture drawn from the tank. The particular design may integrate functions in different assemblies.
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The feed pump.
The injection pump.
The piston, by suction.
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