Flight and Diversion
The pilot departed on a cross-country flight after filling the airplane with 64 gallons of fuel. While en route, thunderstorms were encountered, prompting the pilot to divert to an alternate airport due to deteriorating weather conditions.
Engine Power Loss and Forced Landing
At 1844, during the downwind leg of the traffic pattern, the airplane's engine sputtered and lost power. The pilot executed a forced landing on the base leg of the traffic pattern.
Post-Inspection Findings
Examination of the airplane revealed that the left fuel tank contained 1/2 gallon of fuel and the right fuel tank contained 32 gallons of fuel. The fuel selector was found in the 'off' position. An operational check of the engine was performed; when fuel was added, the engine ran without hesitation.