Posted for Walter Atkinson <walter@advancedpilot.com>:

 Scott:
 
 HIgh altitudes increase the voltage required to jump the gap on the plug.
 
 Also, vapor locks are not in the fine lines above the engine during a hot
start.  The hot start problem is a result of the vapor locking in the heat
soaked engine driven fuel pump.  Cool the engine driven fuel pump and there
are no hot starts.
 
 Merry Christmas.
 
 Walter