ACR LTT HAD ACI REQUEST TO SHUT DOWN PRIOR TO RAMP DEP DUE TO FUEL CAP NOT SECURED.

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WE BOARDED OUR PAXS TO DEPART BDL. STARTED ENGS AND COMPLETED OUR CHKLISTS. AT THIS TIME WE WERE APCHED BY AN UNKNOWN INDIVIDUAL WHO INDICATED TO US SHUT DOWN. I SHUT DOWN THE ENGS AND EXITED THE ACFT TO INVESTIGATE. ONCE OUTSIDE AND AT THE R SIDE OF THE ACFT I BECAME AWARE OF THIS PERSONS CONCERN. WHEN THE ACFT WAS REFUELED; THE FUELER HAD FORGOTTEN TO RESECURE THE PRESSURE POINT. FUELER COVER AND HAD CLOSED THE ACCESS PANEL WITH THE CAP HANGING BY ITS CHAIN OUTSIDE OF THE FAIRING/DOOR. I OPENED THE DOOR; REPLACED THE CAP AND CLOSED DOOR AT WHICH TIME THIS PERSON IDENTED HIMSELF AS A LCL FAA INSPECTOR. HE ASKED TO SEE MY CERTIFICATES AND SUGGESTED I FILL OUT ANY APPROPRIATE RPTS. WHEN THE ACFT WAS FUELED; I WITNESSED IT FROM A POS INSIDE THE ACFT NEAR THE REAR OF THE PAX COMPARTMENT. IT WAS CLR TO ME THAT THE FUELER WAS TRAINING A NEW EMPLOYEE OR SOMEONE UNFAMILIAR WITH THE LTT. I BELIEVE THAT THE PROBLEM OCCURRED WHEN THE TRAINER'S NORMAL PROC WAS INTERRUPTED. DUE TO HIS INCREASED WORKLOAD. THE ACFT WAS PREFLTED AT THE BEGINNING OF OUR TRIP SEQUENCE THAT MORNING AND WAS NEVER LEFT UNATTENDED BY EITHER PLT. FROM MY VANTAGE POINT THE FUELING WAS COMPLETED PROPERLY AS I WASN'T ABLE TO SEE THE CAP FROM INSIDE. THIS SITUATION COULD HAVE BEEN AVOIDED IF THE PANEL HAD BEEN INSPECTED AFTER THE FUELING. THIS WOULD HAVE BEEN IDEAL BUT DO TO OUR QUICK TURN AND US BEING 1 HR BEHIND SCHEDULE IT DIDN'T SEEM PRACTICAL AT THE TIME. SUPPLEMENTAL INFO FROM ACN 224116. THE DAY WAS FILLED WITH INST WX. IT WAS OUR THIRD LEG AND BECAUSE OF THE WX WE WERE RUNNING OVER AN HR BEHIND. I FEEL THAT IN HASTE TO MAKE A QUICK TURN; WITH A GREAT WORKLOAD; CAUSED THE CREW TO OVERLOOK THE SITUATION. I ALSO FEEL FUELERS MUST BE TRAINED WITH BETTER VIGILANCE. ALSO; HAVING NOT EATEN SINCE THE PREVIOUS NIGHT CAUSED US TO CONCENTRATE ON OUR CREW MEALS. THUS; DISTRACTING ATTN. I LEARNED NOT TO TRUST ANYONE BUT MYSELF. ALSO; THAT A FEW MINS OF TIME ON AN ALREADY HR LATE LEG; IS NOT WORTH THE EXTRA BURDEN.