The pilot stated that he and four passengers were about 4.5 hours into the flight and about 10 nm from their destination when the left low boost light illuminated. About 20 seconds later the left engine quit, and the pilot feathered the propeller. After about 1 minute the right low boost light illuminated, and 20 seconds later, the right engine quit. The pilot feathered the right propeller and proceeded to execute a forced landing in the desert 5 miles east of the intended destination. During the accident sequence the right engine separated from the airplane and the left wing buckled, resulting in substantial damage to the airplane. The pilot reported that the airplane had ran out of fuel, and that there were no preimpact mechanical failures or malfunctions that would have precluded normal operation.