Audi 80 Quiz
KE-III-Jetronic Injection System

Pressure regulator

In this manual: KE-III-Jetronic Injection System
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

The pressure regulator is responsible for the mixture composition. This occurs as follows: fuel flow to the lower chambers (through which the mixture quantity can be influenced) takes place via the pressure regulator. If it passes a large amount of fuel into the lower chambers, the pressure in the lower chambers increases. Consequence: the diaphragms of the so-called differential pressure valves deflect toward the valve openings, so less fuel reaches the injection nozzles. The reverse, of course, works in the same way.


The desired result is achieved: the fuel quantity changes in proportion to the incoming air, and the mixture is enriched or leaned.


The pressure regulator receives commands from the control unit. This depends on lambda control, engine temperature and engine load.

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