What was found
NOTED THE FUEL PRESSURE WOULD DROP OFF AS ALTITUDE INCREASE, FROM 5 PSI AT GROUND LEVEL, TO ABOUT 1-1/2 PSI AT 10,000 FEET. TURNING ON BOOST PUMP WOULD RESTORE 5 PSI. INSTALLED ANOTHER NEW PUMP AND IT CURED THE PROBLEM. FAILED PUMP, SN 154723199. GOOD PUMP, SN 154720200. (X)