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How to limit fuel pressure when fuel pump is on ?

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32
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italy
I'm trying to limit the maximum fuel pressure value to 4 PSI when the fuel pump switch is on but even if I set the flight_model.cfg parameter max_pressure_auto_pump=4 when the switch is on the fuel pressure always goes to the maximum value set using fuel_press_max=1044 psf (7.25 psi)

I’m using the old FUEL system as defined in the flight_model.cfg file
 
I can force the behavior with the following code but I was expecting the parameter max_pressure_auto_pump to be relevant:
<Component ID="FuelPump_On">
<Update Frequency="2">
(A:ELECTRICAL MASTER BATTERY:1, Bool) (A:GENERAL ENG FUEL PUMP ON:1, bool) (A:GENERAL ENG RPM:1, rpm) 0 == and and
if{
4 (&gt;A:GENERAL ENG FUEL PRESSURE:1, psi)
}
</Update>
</Component>
 
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