Background
Before departing on a round trip from Manhattan, Kansas, the aircraft owner informed the pilot that the fuel selector for the rear engine was inoperative and prevented selecting the auxiliary fuel tank. Consequently, the pilot did not use either auxiliary fuel tank during the flight.
Event Sequence
After approximately 2.8 hours of flight time on the return leg, the rear engine's power began to fluctuate. The rear boost pump was also inoperative, and the pilot suspected a vapor lock. About 5 to 10 minutes later, the rear engine lost all power. The pilot initiated a diversion to Salem, Arkansas. Shortly thereafter, the front engine also stopped running. An emergency landing was executed on rocky terrain, resulting in damage to the aircraft.
Post-Accident Examination
Following the accident, both main fuel tanks were found intact but empty. A fuel drain from the right auxiliary tank yielded less than one gallon, while approximately six gallons were drained from the left auxiliary tank.