I fly a norm. aspirated LIV and never use the pump, hi or lo for takeoff or landing. It loads up the engine and causes it to die - not desirable.

Fred, et al,

 

How is that possible?  In hot weather, I keep the single speed boost/prime pump on for takeoffs and especially landings (NA IO 320).  Without premature vaporization, the fuel pressure only goes from the normal 24-25 psi to 26-27 psi and changes nothing except for assuring that fuel will be delivered to the throttle body at something more than 12 psi (lo pressure red line).  How could a properly adjusted fuel delivery system be adversely affected by a fuel pressure boost as long as the resultant pressure is in the designed pressure range?  Does the boost pump force it out of range?  Is this just another problem with Cont 550s?