From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: Vapor lock & boost pump
To: lml
Date: Tue, 30 Jan 2007 14:18:50 -0500
Message-ID: <web-1799820@logan.com>
In-Reply-To: <002601c74492$90f52f50$2e01a8c0@your4dacd0ea75>
References: <002601c74492$90f52f50$2e01a8c0@your4dacd0ea75>
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Posted for "Bill Edwards" <wpedwards@hilgardhouse.com>:

  Dear Bill:
  
  Thanks.  I will do the check, and then run it by the A&P who does my
  annuals, and maintenance.  There is another IVP on my field (SMO) that has
  the identical problem which they attribute to heat vaporizing fuel at low
  flow rates.    It doesn't happen after short flights of less than an hour.
  But if I go to altitude and run for a couple of hours, upon landing and
  stopping off the runway, with the RPM at a thousand, the engine quits
  immediately.  It takes a hot start to get it running again.  If I leave the
  fuel pump on, it continues running.  This is true of the other IVP as well.
  My theory was that the low boost pump kept enough pressure to push the heat
  generated vapor moving at low RPM whereas the engine driven pump did not.
  
  REgards,
  
  Bill Edwards
  

"""
  If your engine stalls at idle and you need low fuel pump boost to keep
  it running, it sounds like the idle mixture needs adjusting..
  
  Page 72-70-06 in the TCM Overhaul and Maintenance Manual outlines a
  simple check every time you shut down.(for TSIO-550)
"""