Incident Overview
A pilot reported that during flight, the left fuel tank was nearly empty while the right tank showed a gain in fuel. Concerned by this anomaly, the pilot immediately switched the fuel selector from the BOTH position to the RIGHT tank and began operating the wobble pump. Despite these actions, fuel continued to decrease in the left tank, and shortly thereafter, both engines lost power. The aircraft subsequently executed a forced landing, during which it nosed over.
Examination Findings
Post-accident examination of the aircraft revealed that the fuel vent to the right tank was blocked. This blockage likely prevented proper fuel transfer or equalization, leading to the observed fuel imbalance and eventual engine power loss.
Pilot Statement
The pilot stated that the accident could have been prevented by not running the fuel system on both tanks, particularly when carrying partial fuel loads. This comment reflects the pilot's assessment of the event but does not constitute an official determination of cause.
Conclusion
The incident underscores the critical importance of proper fuel system venting and management. The blocked vent in the right tank was identified as a key mechanical issue contributing to the loss of engine power.