RE: Fuel injection questions

["Hans-Juergen Schneider" <hschnei@ibm.net>]

>...
> The MB also doesn't have a system pressure regulator inside the
> metering head.  Instead, it has a "pressure regulator" valve mounted
> on a bracket behind the fuel metering head. 
>...
This looks like a KE-Jetronic. Is there an electrical connection
to the fuel metering head??

>...
> But the final control pressure is now 3.6 bar - it was 3.4 
> bar before I changed the pressure regulator. 
 
The Bosch specification speaks about 3.7 bar , that looks ok
for your system.

>...
> A bigger surprise came when I measured system pressure.  I had
> hypothesised that the two were brought under one valve's control on
> the MB to allow system pressure to be increased as control pressure 
> is decreased as a result of the vacuum input.  WRONG!  System 
> pressure drops almost 1.0 bar with 0.5 bar of vacuum input.

If it really is a KE-Jetronic the vacuum port on the pressure 
regulator is not used for control purposes! 


> Question four (addendum to Question one): do any other cars (not
> necessarily Audis) use a valve like this in a K-type Bosch injection
> system?

Yes all KE-Jetronic cars but all the control ( warm-up etc. ) is done
via a solenoid system in the fuel metering head.

............................................
. Hans-Juergen Schneider / hschnei@ibm.net .
. 200 Quattro  /  90 Coupe Quattro 20V     .
. Germany                                  .
............................................