What was found
DURING CRUISE NR 1 FWD ELEC FUEL BOOST PUMP LOW PRESS WARNING LIGHT ILLUM. PULLED C/B. WITHIN MIN, PUMP NR 1 FWD PUMP FAILURE, NR 1 AFT ELEC FUEL BOOST PUMP LOW PRESS WARNING LIGHT ILLUM. PULLED C/B & RETURNED. UPON RESET OF C/B'S, SMOKE OBSERVED COMING FROM WIRING ACCESS OPENING ON AFT PUMP. BOTH PUMPS REMOVED & REPLACED. LEAK CHECKS C/O. TEARDOWN INDICATES FUSING OF COMMUTATOR INSIDE PUMP. ALSO INDICATES THAT CONDITION OF PUMP IS TYPICAL OF THIS P/N PUMP. OVERHAULER INDICATED MOST P/N 85816 UNITS SMELL BURNED & COMMUTATOR REPLACED DUE TO MELTING/FUSING. APPROX 6 PUMPS THIS STYLE FAILED WITHIN PAST 12 MO. TEARDOWN REPORTS ALL SIMILAR. SOME UNITS LASTED NO LONGER THAN 400 HRS FROM OVERHAUL.