Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 25; Flight Crew Total 4500; Flight Crew Type 1000
Confusion; Situational Awareness; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport
Human Factors
The purpose of the flight was to perform some post-maintenance engine performance tests. Prior to the flight I determined there was plenty of fuel available. After some take-offs and landings at a local airport; I climbed to 6500' and contacted Approach for advisories while I knew I would be somewhat distracted. I again confirmed adequate fuel but decided I should switch tanks when heading back to base. The tests went smoothly and I turned to head home; descending to 3500' and forgetting to switch tanks. Just east of ZZZ1 the engine stopped. I immediately turned back to ZZZ1; advised ATC of the problem and began trouble shooting. Finally I checked the fuel gauges and realized my error. Switched tanks and the engine soon recovered. Resumed the flight to base and landed without further issue; landing with well more than legal minimums.My take away--anything other than flying the airplane should be more than a solo activity. Using ATC as a second set of eyes for traffic was good but not a substitute for me as PIC keeping focused on flying while someone else does the data collection. Also; be very generous with fuel available.
Cessna 210 pilot reported a temporary loss of engine power due to improper fuel tank management.