1989 Mercedes Benz 420SEL Differential Pressure Regulator Description and Operation
The operating range is from -50 to +150mA. Differential pressure
will be from 0 bar to about 1.6 bar (24 PSI) less than system pressure.
The electro-hydraulic actuator is constructed so that without any
operating current, such as in an electrical failure, the plate valve
would deflect enough under system pressure to maintain a differential
pressure of about 0.4 bar. This combined with the 0.2 bar difference
caused by the pressure regulating springs in the fuel distributor will
result in a difference of 0.2 bar between the upper and lower
chambers in the fuel distributor. Since this pressure difference is the
same as on the earlier CIS system, the car will still be driveable in
the event of an electrical failure. However, it will run roughly because
of the resultant lean air/fuel mixture.
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