You can find and buy High Pressure Fuel Pump / Fuel Injection Pump of high High Pressure Fuel Pump / Fuel Injection Pump – HYUNDAI H Box D (57 . The last carburetor-equipped car came off the assembly line in Since then, fuel injectors have been the primary means of getting gasoline into the engine. For the engine to run smoothly and efficiently it needs to be provided with the right quantity of fuel/air mixture according to its wide range of demands.

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This page was last edited on 20 Decemberat Unsourced material may be challenged and removed. To more easily comply with emissions regulations, automobile manufacturers began installing injfction injection systems in more gasoline engines during the late s.

In this system, fuel is drawn from the tank by an electric pump. The injectors are one of two types, depending on the injection system.

Archived from the original on For the lay individual, the labyrinth of hoses, wire harnesses, manifolds and tubing beneath a car hood might appear intimidating. The fuel is sprayed with the help of a nozzle that is opened and closed with a needle valve, operated with a solenoid.

During the s, other mechanical injection systems such as Hilborn were occasionally used on modified American V8 engines in various racing applications such as drag racingoval racingand road racing. The duration that the injector is open called the pulse width is proportional to the amount of fuel delivered.

How Fuel Injection Systems Work | HowStuffWorks

Nissan also installed multi-point fuel injection in the Nissan Y44 V8 engine in the Nissan President. D577, instead of having a discharge valve in the barrel, it uses a flow divider mounted on top of the engine, which controls the discharge rate and evenly distributes the fuel to stainless steel injection lines to the intake ports of each cylinder.

Later versions of the Rolls-Royce Merlin and Wright R used single point fuel injection, at the time called “Pressure Carburettor”. The control unit is fed by a constant-pressure fuel pump. In a direct injection engine, fuel is injected into the combustion chamber as opposed to injection before the intake valve petrol engine or a separate pre-combustion chamber diesel engine.


An electronic system is operated entirely by a microprocessor innection unit. Other engine sensors used in EFI systems include a coolant temperature sensor, a camshaft or crankshaft position sensor some systems get the position information from the distributorand an oxygen injectiob which is installed in the exhaust system so that it can be used fuuel determine how well the fuel has been combusted, therefore allowing closed loop operation.

InLucas developed its injection system, which was first injectlon for Jaguar racing cars at Le Mans. Instead a manual control on the dash resembling a choke knob or, on later models, a microprocessor alters the position of the shuttle valve within the metering unit.

NY State Journal of Medicine. The injectors spray gasoline into the air intake manifold, where fuel and air mix together into a fine mist. This works much like the spray nozzle of a hoseensuring that the fuel comes out as a fine mist.

Porsche continued using this system on its racing cars into the late seventies and early eighties. This ensures that the fuel is well mixed with the air before it enters the chamber. Excerpts from the Rambler Rebel Owner’s Manual “.

The TCM system is even more simple. The valve e57 opens when the fuel is squirted in. It is then fed straight up pipes to the injectors. The injector simply acts as a spray nozzle to break up the fuel into a fine spray – it doesn’t actually control the fuel flow.

The invention of mechanical injection for injecion aviation engines was by the French inventor of the V8 engine configuration, Leon Levavasseur in However, they were a favorite in the aforementioned competition trials in which essentially wide-open throttle operation was prevalent. With its own high-pressure fuel pump driven by a cable from the distributor to the fuel meter, the system supplied the necessary pressure for injection.


The Mercedes-Benz W Formula 1 racing car engine used Bosch direct injection derived from wartime aircraft engines. Fuel injection also dispenses with the need for a separate mechanical chokewhich on carburetor-equipped vehicles must be adjusted as the engine warms up to normal temperature.

Did cars ever have external combustion engines?

Two common types exist: The amount of fuel sprayed is increased or decreased by a mechanical or electrical control unit – in other words, it is just like turning a tap on and off. Inside the control unit is another restriction, which controls the fuel mixture.

How Fuel Injection Systems Work

Engines so equipped are usually more efficient and more powerful than carburetted ones, and they can also be more economical, as well as having less poisonous emissions.

The solenoid lifts the needle valve from the valve seat, and fuel under pressure is sent in the engine cylinder. The Bosch fuel injectors were placed into the bores on the cylinder wall used by the spark plugs in other Mercedes-Benz six-cylinder engines the spark plugs injectiln relocated to the cylinder head.

These systems suffer from the drawbacks inection being mechanically complex and having poor response to backing off the throttle. The limited production Chevrolet Cosworth Vega was introduced in March using a Bendix EFI system with pulse-time manifold injection, four injector valves, an electronic control unit ECUfive e57 sensors, and two fuel pumps.

Most modern diesel engines use common rail or unit injector direct injection systems. The fuel meter adjusted the amount of flow according to engine speed and load, and included a fuel reservoir, which was similar to a carburetor’s float chamber.