Posted for "Bryan Burr" <bjburr@mwheli.com>:

 While we are discussing the use of the low pressure boost pump over
 10,000' msl I want to state that I do this while operating my TSIO550E
 engine but only after reaching my cruising altitude.
 
 When the fuel pump is turned on to LOW I get a rise in EGT of about 30
 degrees.  Now I would expect that nothing would change unless there is a
 leaning of the mixture. What is happening by turning on the boost pump
 to lean the fuel/air mixture ratio?
 
 Because of this EGT rise and the need for cooling during climb I do not
 turn on the LOW BOOST until I am ready to establish cruise parameters.
 
 What is the concensus about this situation?  I think it odd to have a
 temp rise.
 
 Thanks,
 Bryan Burr
 N132BB