FUEL: Describes a combustible material used to produce energy, making them one of the essential factors in an internal combustion engine.
BLEED: 
Describes the procedure used to remove air bubbles from hydraulic lines and components of a system.
BLEEDING A FUEL INJECTION SYSTEM: Describes the procedure of removing air bubbles from a fuel injection system so that they will not impede the flow of liquid through that system.
COLD START ENRICHMENT: Describes a method of providing a higher ratio of fuel to air for starting a cold engine. In some cases, more fuel is fed into the engine with a cold start injector; in other cases, the amount of air is restricted through a choke.
COLD START INJECTOR: Describes a device in a fuel injection system that shoots an extra amount of fuel into the cylinder to increase the ratio of fuel to air.
DECELERATION FUEL CUT-OFF: Describes a device that stops the flow of fuel to the carburettor or injectors when the vehicle rapidly decelerates in the event of an accident, preventing the possibility of a fire or explosion.
DECOMPRESSOR: Describes a manually operated valve used to release compression in a cylinder by allowing air to escape, clearing the way for enabling manual ignition of an engine that has been out of service.
DIRECT INJECTION: Describes a fuel injection system generally used in diesel engines that forces fuel directly into the combustion chamber.
ELECTRONIC FUEL INJECTION:(EFI or EFi) Describes a system that injects fuel into the engine and includes an electronic control unit to time and meter the flow. Fuel is delivered in intermittent pulses by the opening and closing of solenoid-controlled injectors.
ELECTRONIC SENSING DEVICE (ESD): Describes an electronic device for vehicles fitted with a fuel injection system. The ESD detects changes in speed and driving conditions and determines the amount of fuel injected into the combustion chamber, thus eliminating the need for carburettors.
EMS SYSTEM: Describes a type of electronic engine control system covering at least the fuel injection and ignition functioning, although it may also include emission controls and self-diagnostics.
FUEL ADDITIVE: Describes a chemical preparation added to fuel to improve its properties
FUEL-AIR MIXTURE: Describes a combination of vapourised fuel and air brought into the cylinder through the carburettor or fuel injectors to produce the power needed to drive the engine.
FUEL CAP: Describes a vented covering on the top of the tube leading to the fuel tank.
FUEL CHARGE: Describes the air/fuel mixture delivered to the combustion chamber.
FUEL DISTRIBUTOR: Describes the device that supplies the injection with pressurised fuel in proportion to air volume, measured by the airflow sensor plate, with all fuel metering taking place inside the fuel distributor
FUEL-INJECTED ENGINE: Describes a gasoline engine with a fuel injection system rather than a carburettor.
FUEL INJECTION (FI): Describes a fuel system that does not use a carburettor; instead, it sprays fuel directly into the cylinders or into the intake manifold just ahead of the cylinders.
FUEL INJECTION PUMP: Describes a pump that absorbs fuel from the fuel tank and delivers it under pressure to the injectors
FUEL INJECTOR: Describes a type of injector found in fuel injection systems that sprays gasoline into the inlet ports or, in the case of diesel, directly into the combustion chamber.
FUEL INJECTOR NOZZLE: Describes the device that operates in the same principle as a hypodermic needle to inject the proper amount of fuel into the combustion chamber in response to signals from an electronic sensing device on cars with fuel injection systems.
FUEL PRESSURE: Describes the pressure under which fuel is delivered to the injectors by the fuel pump, governed by the pressure regulator
FUEL PRESSURE REGULATOR: Describes a pressure-activated diaphragm valve in a fuel injection system that maintains the pressure in a fuel system to a pre-set value above manifold pressure.
FUEL PUMP: Describes a form of vacuum device, operated either mechanically or electrically, that is used to draw gasoline from the tank and sends it into the carburettor or fuel injector nozzles
FUEL PUMP SHUT-OFF SWITCH: Describes a switch designed to shut off the electric fuel pump and fuel to the engine in the event of a collision.
FUEL RAIL: Describes a manifold designed to provide an extensive reservoir of pressurised fuel for the fuel injectors, attached between the rail and the intake runners or the cylinder head.
FUEL RETURN LINE: Describes a pipe whose role is to return surplus fuel to the carburettor tank.
FUEL STARVATION: Describes a situation where the fuel system's failure to supply sufficient fuel preventing the engine from running correctly.
FUEL SUPPLY: Describes the delivery of fuel to the carburettor or injection system
FUEL SYSTEM: Describes a system that stores, cleans, and delivers the fuel to the engine in proper quantities to meet its varying needs.
FUEL TANK: Describes the storage compartment that holds the fuel for the vehicle.
FUEL TANK SENSOR: 
Describes a level sensor in the gas tank that sends information about the remaining fuel.
FUEL TANK VAPOUR VALVE: Describes a type of valve mounted on top of the fuel tank that vents excess vapour and pressure from the fuel tank into the evaporative emission control system.
