THE ACFT CRASHED IN A WOODED AREA DURING A FORCED LANDING FOLLOWING A POWER LOSS ON BOTH OF ITS ENGINES. THE ACFT HAD BEEN FLOWN TO BIMINI FROM OPA-LOCKA, FL. ABOUT 75 GALLONS OF FUEL WAS DRAINED FROM THE ACFT. UPON THE RETURN TO FT LAUDERDALE, FL, THE LANDING GEAR HAD TO BE MANUALLY OPERATED BECAUSE OF A KNOWN PRE-EXISTING ELECTRICAL PROBLEM. THISALSO PRECLUDED RADIO COMMUNICATIONS. UPON EXECUTING A TOUCH AND GO LANDING AT FT LAUDERDALE THE FUEL PRESSURE LIGHTS WHICH HAD BEEN FLICKERING NOW CAME ON STEADY ON THE RIGHT ENGINE. THE PLT CUT THE MIXTURE ON THAT ENGINE AT 500 FT AGL. ALMOST IMMEDIATELY THE LEFT ENGINE LIGHT CAME ON AND IT QUIT ALSO. THE ACFT WAS CRASH LANDED. POST ACCIDENT EXAMINATION REVEALED THAT ALL FUEL TANKS WERE EMPTY. THE ACFT OWNER SAID THE ACFT HAD 145 GALLONS ON BOARD PRIOR TO LEAVING FLORIDA.THE ACFT FLEW ABOUT 1 HOUR AND 2O MINUTES AT 50 GALLONS AN HOUR PLUS OFFLOADING 75 GALLONS AT BIMINI.