fuel injection

noun
the spraying of liquid fuel into the cylinders or combustion chambers of an engine.

Origin:
1895–1900

fuel-injection, adjective
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World English Dictionary
fuel injection
 
n
a system for introducing atomized liquid fuel under pressure directly into the combustion chambers of an internal-combustion engine without the use of a carburettor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Bikes only relatively recently switched to fuel injection over carbs.
First, it has managed to get fuel to ignite in volumes too small for a spark or
  fuel injection to work.
Roller cam, roller lifters, balance shafts and fuel injection.
The catalytic converter was a necessary evil prior to fuel injection, when the
  car had a carburetor, but those days are gone.
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