WHILE ENROUTE TO NAPA, CA, THE ACFT SUSTAINED A TOTAL ENGINE POWER LOSS DUE TO FUEL EXHAUSTION. THE PILOT REPORTED THAT HE TOPPED THE FUEL TANKS 2 DAYS BEFORE THE ACCIDENT. HE FLEW THE AIRPLANE ON A 20 MINUTE FLT FM CORONA ARPT TO SNA ARPT. HE DEPARTED SNA AND FLEW TO HARRIS RANCH, ABT A 2.2 HR FLT, AND THEN ONTO NAPA. THE PLT HAD PLACED THE FUEL SELECTOR ON THE BOTH POSIITON ON THE FLT TO NAPA. AFTER REACHING THE CRUISING ALT THE PILOT SELECTED THE RIGHT TANK. ABT 1.1 HRS LATER WHEN THE FLT WAS BETWEEN NAVY'S CROWS LANDING AND STOCKTON, CA THE RIGHT TANK'S FUEL WAS TOTALLY CONSUMED. THE PLT SWITCHED TANKS AND ELECTED TO LAND AT CONCORD. WHEN THE AIRPLANE WAS APPROACHING BRENTWOOD, ABT 0.3 HOURS LATER THE AIRPLANE SUSTAINED TOTAL FUEL EXHAUSTION. THE FLT TIMES NOTED ARE ESTIMATED BASED ON AN AVERAGE GROUND SPEED OF 97 KNOTS.