Quote:
Originally Posted by thomastee
Many thanks for the reply L.J.
So if I connect the banjo downstream of the gauge and downstream of the shut off valve, why would my system pressure reading be any different?
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Good thinking. It would not be different with the valve shut off. However, when you open the valve, fuel will flow through the control system and you will have a different reading which is control pressure.
When the system is "open", you only read control pressure. I can't exactly explain all the dynamics but fuel not used by the injectors is sent back to the fuel tank. For a layman like me that helps explain why control pressure is less than system pressure - some of the pressure is bled off.