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CIS Warm Control Pressure at Full Flow
Should a WUR maintain the set warm control pressure when the metering plate is full up and injectors spraying at max?
My warm control pressure is set to 2.9 bar with system pressure at 4.8 bar. As I raise the metering plate past ~ 3/4 (engine off / fuel pump running / injectors in bottles), the warm control pressure starts falling and stops at ~ 2.5 bar. Low to middle metering plate positions give me normal control pressure.
The car is a '74 911. I don't have any running issues and AFRs are as expected throughout RPM / load range. This is with the original 001 WUR and throttle position pressure valve in place. Just makes me wonder if I have a weak or failing fuel pump.
Thanks for any input.
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