THE ACFT CRASHED INTO TREES DURING A FORCED LNDG AFTER BOTH ENGS LOST PWR. THE ACFT HAD BEEN RECENTLY PURCHASED AND WAS BEING FERRIED TO THE NEW OWNER. THE ACFT HAD BEEN FLOWN ONLY 40 HRS SINCE THE LAST ANNUAL INSPECTION WHICH WAS DONE ON 1/19/84. IT WAS REPORTED THAT THE ACFT HAD SAT UNUSED FOR A CONSIDERABLE TIME PRIOR TO BEING PURCHASED BY ITS NEW OWNER. THE PLT FOR THE ACC FLT CONDUCTED A PRE-FLT AND DID NOT REQUEST ANY SERVICE EVEN THOUGH HE COULD NOT SEE FUEL IN THE MAIN TANKS. THESE TANKS WERE ESTIMATED AS HALF FULL BY THE PLT. THE PLT STATED THAT DURING THE 1ST HOUR OF THE FLT HE SELECTED FUEL FROM THE MAIN TANKS. THE SELECTOR WAS PLACED ON AUX POS FOR THE NEXT HOUR AFTER WHICH THE REAR ENG LOST POWER & WAS FEATHERED. A SHORT TIME LATER THE FRONT ENG QUIT. THE PLT WAS UNABLE TO RESTART EITHER ENG HE SAID AND A GLIDE FROM 5000 FT WAS STARTED TO REACH A HIWAY 8 MILES AWAY, WHICH FAILED. NO MECH PROBLEMS EXCEPT MINOR FUEL CONTAMINENTS WERE FOUND DURING INVEST. DUE TO A MISCALCULATION THE ACFT WAS DISMANTLED PRIOR TO INVESTIGATION