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Stu:  The manifold drains on the IO-550 are no different than the ones for
the TSIO version.  There are 2 drain manifolds to tee together and then run
the line to the "sniffle" valve.  This provides a overboard drain when the
engine is overprimed, and will leak any extra fuel from the intake valve area
after shutdown, and the "sniffle" valve will close during operation in either
high or low MAP.  

Mike
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LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
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