Incident Overview
A private pilot and a certified flight instructor (CFI) were conducting a biennial flight review. During the preflight inspection, the private pilot estimated that approximately 20 gallons of fuel were onboard. The CFI accepted the pilot's word without verifying the amount. The operator reported that the CFI was aware the left fuel gauge was inoperative. No dipstick was used to measure the fuel quantity before takeoff.
Sequence of Events
After about 35 minutes of flight, while the student pilot was executing a go-around from a simulated forced landing, the engine lost power. Full power was restored when the nose was lowered. Approximately one to two minutes later, the engine lost power again and could not be restarted.
Emergency Landing
During the subsequent emergency landing, the aircraft struck a saguaro cactus, resulting in damage to the aircraft. No fuel was found in the tanks after the accident.
Findings
Post-accident examination revealed no fuel in the aircraft's tanks. The left fuel gauge remained inoperative.