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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The amount of fuel injected is controlled by a flap valve located in the engine’s air intake.

How Direct Injection Engines Work

The system uses tubes with poppet valves from a central injector to spray fuel at each intake port rather than the central throttle-body [ citation needed ]. The first system uses continuous injection where the fuel is squirted into the inlet port all the time the engine is running.

This postponed the redesign and tooling costs of these components. With their extremely fast response time, multiple injection events can occur during each cycle of each cylinder of the engine.

Many motorcycles still use carburetored engines, though all current high-performance designs have switched to EFI. 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 sensor which is installed in the exhaust system so that it can be used to determine how well the fuel has been combusted, therefore allowing closed loop operation.

The process of determining the necessary amount of injecyion, and its delivery into the engine, are known as fuel metering. These basic premises make a tremendous difference in inmection engine’s fudl efficiency.

The carburetor remains in use in developing countries where vehicle emissions are unregulated and diagnostic and repair infrastructure is sparse.


Every part explained There’s ridiculous detail on every part. The header has a high pressure relief valve to maintain the pressure in the header and return the excess fuel to the fuel tank.

Clearly and easily explained. The pressure drop across the restrictions in the control unit controls the amount of fuel flow, so that fuel flow is directly proportional to the pressure at the flow divider. This section needs additional citations for verification. Porsche racing variants such as the RSR 2. Petrol engines can use gasoline direct injectionwhere the fuel is directly delivered into the combustion chamberor indirect injection where the fuel is mixed with air before the intake stroke.

The other popular system is timed injection pulsed injection where the fuel is delivered in bursts to coincide with the induction stroke of the cylinder. Many modern EFI systems use sequential MPI; however, in newer gasoline engines, direct injection systems are beginning to replace sequential ones. W8 W12 W16 W With the improved cylinder-to-cylinder fuel distribution of multi-point fuel injection, less fuel is needed for the same power output when cylinder-to-cylinder distribution varies significantly, some cylinders receive excess fuel as a side effect of ensuring that all cylinders receive sufficient fuel.

An electronic system is operated entirely by a microprocessor control unit. For the lay individual, the labyrinth of hoses, wire harnesses, manifolds and tubing beneath a car hood might appear intimidating. This was basically a specially lubricated high-pressure diesel direct-injection pump of the type that is governed by the vacuum behind an intake throttle valve. Fuel injection introduces potential hazards in engine maintenance due to the high fuel pressures used.

Mechanical systems have now been largely superseded by electronic fuel injection known as EFi for short.

Journal of Propulsion and Power. 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.


NY State Journal of Medicine. MPI systems can be sequentialin which injection is timed to coincide with each ruel intake stroke; batchedin which fuel is injected to the cylinders in groups, without precise synchronization to any particular cylinder’s intake stroke; or simultaneousin which fuel is injected at the same time to all the cylinders.

The duration that the injector is open called the pulse width is proportional to the amount of fuel delivered. The engine had six electrically operated injectors and were fed by a semi-high-pressure circulating fuel pump system.

How a fuel injection system works | How a Car Works

The EFI system was developed to satisfy stringent emission control requirements and market demands for a fuwl advanced responsive vehicle. Before we look inside the direct injection engine, let’s view a quick second in the life of injectiln standard gasoline engine for a more complete look at the gasoline engine, check out How Car Engines Work.

The fuel then squirts out into the inlet port in the cylinder head. CS1 French-language sources fr CS1 Swedish-language sources sv CS1 Italian-language sources it CS1 Japanese-language sources ja Wikipedia indefinitely semi-protected pages Use dmy dates from January All accuracy disputes Articles with disputed statements from April All articles with unsourced statements Articles with unsourced statements from April Articles lacking in-text injechion from May All articles lacking in-text citations Articles with unsourced statements from June Articles needing additional references from May All articles needing additional references.

A special pump sends the fuel under pressure from the fuel tank to the engine bay where, still under pressure, it is distributed individually fue each cylinder. There are several competing objectives such as:.