ACFT B737-300. ALTDEV ON DEP SID. FLC HAD WRONG SID SET IN FMS. MULTIPLE DISTRS PRIOR TO FLT INCLUDING AN INOP APU; MARGINAL FUEL WITH LONG GND DELAY AND DEPARTING FROM AN OFF-LINE STATION.

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FIRST LEG OF CHARTER FLT WAS 12 MINS AIR TIME FROM SRQ TO PIE. SECOND LEG WAS FROM PIE TO BUR. ACFT HAD AN INOP APU WHICH WAS ON AN MEL. THIS CAUSED SVCING DELAYS AT PIE BECAUSE WE HAD TO REQUEST A GND PWR UNIT (GPU) AND AN AIR START CART. ALSO; CREWS FROM THIS AIRLINE NORMALLY FLY SCHEDULED RTES. PIE IS AN OFF-LINE STATION. ALTHOUGH TRAINED ON HOW TO MAKE UP FUEL SLIPS AND GET WT AND BAL INFO; THE AIRLINE HAS AUTOMATED THESE PROCS; SO THAT AT ON-LINE STATIONS; THIS WORK IS DONE BY GND AGENTS AND COMPUTERS. THE PIE-BUF LEG WAS FLOWN BY THE FO AND AFTER THE INCIDENT; WE DISCUSSED THE PROB AND BELIEVE THAT WHEN WE RECEIVED THE CLRNC AND WE WERE CLRED 'AS FILED; ST PETERSBURG 1 DEP;' THE FO MISTAKENLY LOOKED AT THE SARASOTA DEP AND PUT IN 3000 FT INSTEAD OF 1600 FT ON THE ST PETERSBURG DEP. ON THE DEP BRIEF BY THE FO; I ACCEPTED THE ALT WITHOUT CHKING BECAUSE WE BECAME INVOLVED IN THE HORIZ MANEUVERING WE NEEDED TO PERFORM TO COMPLY WITH THE SID. AFTER TKOF WE SWITCHED TO DEP CTL AND RPTED OUT OF 1900 FT. HE ADVISED WE WERE SUPPOSED TO BE AT 1600 FT; BUT TO CLB AND MAINTAIN 4000 FT. THERE WAS NO TFC CONFLICT EITHER ON OUR TCASII OR RPTED BY DEP CTL OR VISUALLY. ONE OTHER ITEM: WE WERE CONCERNED ABOUT THE AMOUNT OF FUEL NEEDED FOR TKOF RELEASE AS THERE WAS A HOLD ON DEPS BY TAMPA DEP. OUR TAXI TIME WAS 27 MINS. NORMAL IS 5 MINS. CORRECTIVE ACTIONS: MORE VIGILANCE BY COCKPIT CREWS. NOT DISPATCHING ACFT WITH IMPORTANT MELS TO OFF-LINE STATIONS.