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     Don,
     
     If memory serves me correctly, the pump uses NPSF threads which are
     straight and exist only as internal threads.  They can mate with
     several external pipe threads but not ANPT used on AN fittings.  An
     adapter and O ring is available that mates with the NPSF thread and
     provides a tapered internal thread for use with standard AN fittings.  
     I got my adapters from Sacramento Sky Ranch.  I think it is a Lycoming
     part.  I described the installation to the folks at Sacramento Sky
     Ranch and they knew what part was needed.  
     
     Chris Zavatson
     N91CZ