A B757 FLC FAILS TO CAPTURE THE OUTBOUND RADIAL OF BNA AS SPECIFIED WITHIN THE SID DEP PROC. CREW HAD SUFFERED A GND HOLD; TFC DELAY; AND CITES CONCERN OVER FUEL REMAINING.

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JUST WAS NOT A GOOD START TO THE DAY. ON ARR AT ARPT; WENT STRAIGHT TO PLANE AND PERFORMED ACFT PREFLT. UPON COCKPIT PREFLT; IT WAS DISCOVERED THAT THE WARNING SYS DID NOT CHK OK. BNA IS A NON MAINT STATION; SO CREW BEGAN TO CHK MEL; CIRCUIT BREAKERS; AND OPERATING MANUAL FOR REMEDY. I CALLED ATL MAINT COORDINATOR AFTER APPROX 15 MINS OF UNSUCCESSFUL TROUBLESHOOTING. DURING PHONE CONVERSATION WITH ATL MAINT; THE FO INFORMED ME HE FINALLY GOT AN OK TEST ON THE FIRE DETECTION SYS. NOW TO THE FLT PLAN. THE REVIEW INDICATES FUEL LOAD SOMEWHAT MINIMAL BUT LEGAL FOR ATL; CONSIDERING OUR TIME OF ARR AND WX SHOWING 3-4 NM VISIBILITY. TO INCREASE FUEL LOAD WOULD RESULT IN A DELAY SO I DECIDED TO GO WITH DISPATCHER'S FUEL LOAD. WE PERFORMED CHKLISTS AND BRIEFED THE BNA 8 DEP FROM RWY 2R WHICH IS 'TURN TO 045 DEGS AND INTERCEPT THE BNA 068 DEG RADIAL; CLB TO 5000 FT.' UPON ENG START; ATC INFORMS US OF A 40 MIN GND STOP ON FLTS TO ATL FOR TFC/WX. WE TAXI TO RWY 2R RUNUP AREA AND HOLD FOR RELEASE. WE SPEND APPROX 30 MINS IN RUNUP AREA AWAITING RELEASE AND SWEATING FUEL. ON TKOF; WE TURN TO 045 DEGS AND CLB TO 5000 FT; BUT FORGET TO INTERCEPT THE BNA 068 DEG RADIAL. I BELIEVE WE FAILED TO INTERCEPT THE RADIAL BECAUSE OUR DEP BRIEF WAS 50+ MINS OLD AND WE WERE TOTALLY FOCUSED ON OUR MINIMUM FUEL STATUS FOR FLT TO ATL. NO CONFLICT WITH OTHER TFC NOTED. NO QUERY FROM ATC.