My fuel pressure regulator (Airmotive) is getting its MAP from the two small (1/8 “) tubes that lay in the primary ports on the Renesis…Are you saying that I should move this pressure reference to someplace else?  You say you know it is not good…How do you know this?

Bill B 

Bill;

I was measuring fuel pressure to the fuel rails to verify the EM2 calibration.  The needle on the gauge was swinging very rapidly from about 20 to 40.  I don’t recall what RPM, but I guess near idle.  Perhaps stating that “it is not good” is an overstatement, and perhaps it just happened that the pressure pulses hit a resonance in the gauge; but my judgment was that it could affect the engine operation and could be damaging to something else long term.  I had already put damping in MAP line to the EC2, so I decided to T it into that line, and the pressure pulsing went away.

I have a 3-barrel TWM TB on a short intake manifold.  The MAP sensing ports are just downstream of the throttle plates.

Al