Description of the K-Jetronic fuel injection system (Mercedes-Benz E-Class W123)

Fuel injection system "K-Jetronic" is a mechanical system of continuous fuel injection. The injectors constantly spray fuel into the intake manifold before the intake valves. Therefore, the change in fuel consumption is achieved not by changing the duration of the injector opening, but by regulating the amount of fuel supplied to the injectors.

The amount of air supplied is continuously measured by the air flow meter, and the amount of fuel injected is strictly proportional to the amount of air supplied (with the exception of a number of engine operating modes, such as cold engine starting, operation under full load, etc.) and is regulated by a fuel dispenser-distributor.

Fuel injection system diagram "K-Jetronic"

1 - fuel tank; 2 - fuel pump; 3 - fuel filter; 4 - fuel storage tank; 5 - supply pressure regulator; 6 - air flow meter; 7 - fuel dispenser; 8 - control pressure regulator; 9 - injection nozzle; 10 - intake manifold; 11 - starting nozzle; 12 - throttle valve; 13 - additional air supply valve; 14 - temperature sensor; 15 - distributor; 16 - relay block; 17 - ignition switch; 18 - battery

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E-Class W123 / Fuel injection «K-Jetronic»

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Air flow meter
Fuel dispenser and dispenser
Injectors — General Description
Checking the injection system
Adjusting engine idle speed

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