THE PILOT REPORTED HE TOOK OFF FROM FRONT RANGE AIRPORT, WATKINS, CO, EN ROUTE TO JEFFCO AIRPORT, BROOMFIELD, CO, A FLIGHT DURATION OF APPROXIMATELY 30 MINUTES, WITH 12 GALLONS OF FUEL ON BOARD. WHILE ON BASE LEG AT JEFFCO, THE ENGINE LOST POWER. WHILE TURNING ONTO FINAL APPROACH, THE AIRPLANE COLLIDED WITH GUY WIRES AND CRASHED. THE PASSENGER TOLD THE AIRPORT OPERATIONS MANAGER THEY HAD 'RUN OUT OF GAS.' EXAMINATION DISCLOSED NO FUEL IN THE FUEL TANKS. THE FUEL SYSTEM HAD NOT BEEN COMPROMISED. THERE WERE NO FUEL STAINS ON THE GROUND.