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As has been pointed out your pressure readings are implausible. The posibilities for such are that you have a defective gauge or you are testing at the wrong point. Use the image included and indicate where your fuel preesure reading are taken at. For control pressure you should be reading pressure inside pipe #776. Because I don't like to mess with the running that using the tee valve does to get system pressure I use two gauges or one gauge two times to read the two pressures. (In other words the mechanism for reading system pressure with the valve is to block off control pressure till it reaches system pressure to achieve a reading. This cause the engine to run very poorly as during that moment system pressure equals control pressure not good for fuel mixture preperation)
For system pressure I have a tee fitting that reads the pressure as it enters the distributer.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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