NTSB Identification: CHI04CA141.
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Accident occurred Sunday, June 06, 2004 in Fort Scott, KS
Probable Cause Approval Date: 09/01/2004
Aircraft: Doerr Raymond R RV-9A, registration: N369RV
Injuries: 1 Minor.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The experimental amateur-built airplane experienced a loss of engine power during cruise flight when fuel pressure decreased to a level below the normal operating range. The fuel pressure continued to be below normal after the airplane's secondary fuel pump automatically actuated. The pilot then executed a forced landing on a field where the airplane impacted a ditch and nosed over. Inspection of the airplane revealed that the airplane was fueled with automotive fuel. The pilot reported an ambient temperature of 80 degrees Fahrenheit. A post accident engine run did not duplicate a loss of engine power.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The vapor lock of the airplane fuel system and the ditch encountered during the emergency landing..

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