fuel injection(n = noun.artifact) fuel injection system - mechanical system to inject atomized fuel directly into the cylinders of an internal-combustion engine; avoids the need for a carburetor;
is a kind of mechanical system

diesel fuel, epidural injection, fossil fuel, fuel, fuel cell, fuel consumption rate, fuel filter, fuel gauge, fuel indicator, fuel injection system, fuel level, fuel line, fuel oil, fuel pod, fuel system, injection, intradermal injection, intramuscular injection, intravenous injection, nuclear fuel, rocket fuel, subcutaneous injection