Here is a 4 page article that explains a lot about the TCM fuel system.  It is NOT like the Lycoming at all. 

A quote from the article...

"The TCM System varies greatly from its Lycoming counterpart, the Bendix Fuel Servo.  Perhaps most noticeable is the absence of a venturi to schedule fuel flow proportionate to air flow. The Bendix  system regulates fuel flow by means of a delta pressure across an air diaphragm. Comparatively, the  Continental System has no way to sense airflow. It does not compensate for altitude or density changes, nor does it correct for MAP unless turbocharged. "

http://www.kellyaerospace.com/articles/ContinuousFlow.pdf#search=%22io550%20fuel%20pump%22

Bob Belshe
Moraga, CA
Lancair 235/320  
http://home.comcast.net/~rbelshe/

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