ACFT FUEL EQUIP DESIGN PROB DISCOVERED 'ACCIDENTLY' IN A NIGHT OP.

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WHEN TAXIING FOR TKOF I LOST SIGHT OF VISUAL REFS FOR TXWY AND STRUCK A TXWY LIGHT WITH THE PROP. I RETURNED TO RAMP FOR DAMAGE CHK. PURELY COINCIDENTALLY; AFTER THE FRONT PAX AND I EXITED THE ACFT I OBSERVED FUEL FLOWING FREELY FROM THE ACFT'S BELLY DRAIN. I EVACUATED REMAINING PAX AND DETERMINED THAT THE BELLY DRAIN ACTUATOR; WHICH IN THE CHEROKEE 6 IS LOCATED ON THE FRONT OF THE PAX SEAT BEHIND THE COPLT POS; WAS STUCK OPEN. APPARENTLY THE MIDDLE SEAT PAX MUST HAVE WHILE BOARDING; CAUGHT A SHOE ON THE DRAIN ACTUATOR COVER; AS THE PLASTIC COVER WAS HALF RIPPED OFF (1 SCREW ATTACHED; 1 SCREW OUT) AND THE COVER HAD CAUGHT ON AND PULLED OPEN THE HANDLE. IF I HAD NOT HIT A LIGHT AND RETURNED TO CHK THE PROP; I WOULD HAVE FLOWN MY TRIP WITH A WIDE-OPEN FUEL DRAIN! CONTRIBUTING FACTORS TO THE BELLY DRAIN BEING KICKED OPEN: IT IS POOR DESIGN TO HAVE THE DRAIN'S ACTUATOR IN A PAX AREA. NO ONE WOULD SUSPECT THIS FREAKISH OCCURRENCE; LEASTWAYS A PAX; WHO WAS UNAWARE HER SEAT HOUSED AN ACFT FUEL DRAIN. IT WAS DARK AND SHE WOULDN'T HAVE SEEN AN OPEN COVER. THIS DRAIN SHOULD BE ACTUATED FROM OUTSIDE THE PLANE; LIKE THE 4 TANK DRAINS ARE. PLT ACTED PROPERLY IN CHKING FOR DAMAGE AFTER STRIKING TXWY LIGHT. SEVERAL PLTS HAVE MENTIONED THAT THEY MIGHT HAVE 'JUST KEPT GOING AS LONG AS THERE WASN'T ANY VIBRATION.' PROP DAMAGE IN THIS CASE REQUIRED PROP OVERHAUL. AND IF I HADN'T CHKED FOR DAMAGE; I MIGHT HAVE RUN A TANK DRY ON AN OVERWATER FLT; DUE TO UNRELATED OPEN DRAIN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES SHE DID NOT FOLLOW UP BECAUSE IT IS SUCH A FREAKISH ACCIDENT SHE DID NOT THINK IT WOULD HAPPEN OFTEN. BUT SHE DOES BELIEVE IT IS A POOR DESIGN AND SHOULD BE CHANGED SO THERE IS NO CHANCE OF SUCH A FUTURE OCCURRENCE. HER COMPANY REPLACED THE COVER AND MADE SURE IT WAS ABSOLUTELY FLAT WITH NO AREAS THAT COULD CATCH ON A SHOE AND BE PULLED UP. PART OF RPTR CONCERN IS THAT SHE HAS NO IDEA HOW FAST THE FUEL MIGHT DRAIN OUT. SHE WAS FLYING OVERWATER TO AN ISLAND AND MIGHT HAVE HAD PROBS PRIOR TO DEST.