Primary finding
Probable cause
The pilot did not select the remaining fuel supply. Factors include a deteriorated fuel selector valve.
Investigator assessment
Analysis narrative
The pilot noted a fuel imbalance, with more fuel remaining in the left main tanks. A forced landing was made when both engines lost power, after exhausting the fuel from the right main tanks. The pilot failed to access the approximate fifty gallons remaining of the left main fuel supply by positioning the right fuel selector in crossfeed position for the right engine. Later trouble shooting revealed that the left fuel selector valve had not been in its detent, and both engines had been feeding from the right main tanks. O rings in the fuel valve had deterioraed to the extent that the internal spool valve felt like it was in its detent when it was not.
Source record
Factual narrative
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