AN MD88 ON TAXI OUT DECLARED AN EMER DUE TO A #2 ENG TAILPIPE FIRE CAUSED BY INCORRECT STARTING PROCS.

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SECOND DAY OF 3-DAY ROTATION WITH NEW HIRE FO (TENDS TO GET FLUSTERED AND GET AHEAD OF HIMSELF). ON SECOND ENG START WHILE TAXIING OUT; FO TYPICALLY PERFORMS THE ENTIRE START WHILE CAPT TAXIES. FO TURNED FUEL ON AT 22% N2; BUT HAD INADVERTENTLY LEFT IGNITION OFF AFTER FIRST ENG START. RELEASED STARTER SWITCH; BUT LEFT FUEL LEVER ON. AFTER SPOOL DOWN AND UPON SECOND ENG START ATTEMPT; GOT PREMATURE LIGHT-OFF AND SUBSEQUENT HOT START OF 530 DEGS C WITH ACCOMPANYING TAILPIPE FIRE AFTER SHUTDOWN. WE PULLED OVER IN THE RUN-UP AREA; SUMMONED THE FIRE TRUCK; AND MOTORED THE ENG TO TRY AND PUT THE SMALL FIRE OUT. AS THE FIRE TRUCK ARRIVED; TWR CONFIRMED WITH THE FIRE TRUCK THAT IT APPEARED EXTINGUISHED. WE HAD THE FIRE TRUCK FOLLOW US BACK TO THE GATE IN CASE OF ANY RELIGHT. OUR DISPATCHER AND MAINT COORDINATOR INSTRUCTED CONTRACT MAINT TO VISUALLY INSPECT THE ENG. NO DAMAGE OBSERVED. WE CALLED THE COMPANY REPRESENTATIVES AGAIN; AND WITH THEIR CONCURRENCE; WE MOTORED THE ENG TO CLR ANY REMAINING POOLED FUEL AND GET THE RESIDUAL EGT DOWN TO 35 DEGS C; WITH THE FIRE TRUCKS AND CONTRACT MAINT OBSERVING. AFTER LOGBOOK SIGN OFF; WE STARTED THE R ENG FIRST AT THE GATE WITH THE CABIN DOOR OPEN AND THE FIRE TRUCKS STANDING BY; SO IF WE HAD ANY TROUBLE; WE COULD EVAC THE PAX QUICKLY. AFTER A NORMAL ENG START OF 360 DEGS C; WE PUSHED BACK; STARTED THE OTHER ENG; AND PROCEEDED UNEVENTFULLY TO DEST BANGOR; ME.