American champion 8KCAB pilot reported executing a precautionary landing on a road after realizing t...

Narrative:

I recognized that fuel calculations/usage was incorrect and elected to make a precautionary landing on a clear straight road with control rather than proceeding the 6 miles over housing to airport. While this situation is 100% my responsibility there are a few factors that worked against me in the lead up to this situation.1. Aircraft was 'rushed' out the door by [maintenance facility] due to pressure from aircraft owner. This was due to the [maintenance facility] taking a far longer time to repair than originally quoted. The aircraft underwent an annual inspection however I was never informed that they had changed the EDM930 engine monitoring system. Fuel tanks filled at [maintenance facility].2. Departed VFR with the possibility of weather closing in. After 30 minutes flight time aircraft started a pronounced right roll that had to be held off. Elected to land at [at a nearby airport] due weather and to inspect aileron roll problem.3. [The maintenance facility] found the right aileron linkage jamb nuts loose and vibration was pulling out of adjustment. Adjusted 3 full turns and tightened these nuts and flight the next day was improved with only slight correction required. **Should have filled tanks [there] as I had no weight and balance restrictions**4. Submitted my flight plan trusting the EDM930 fuel flow results of 6.5 gph. Not sure why I believed this figure however the EDM930 has always been very accurate. I did not know at the time that the [maintenance facility] had messed up this unit. Departed with sight gauges reading 3/4 on the ground and full in flight.5. Inflight I noticed the EDM930 reading 35% power and started to mistrust this unit. After referring back to the wing tank sight gauge I noticed it quickly moved from 1/4 tanks to empty. Diverted my plan towards [a nearby alternate] and notified ATC that I had a fuel problem.I continued flight towards [the alternate] and had landing clearance. Engine started to run lean and rough. Notified ATC of location and landed with power and control. [ATC assisted with services required]. I refueled [and continued uneventfully].

Original NASA ASRS Text

Title: American Champion 8KCAB pilot reported executing a precautionary landing on a road after realizing the engine monitoring system fuel indications were incorrect and fuel was inadequate to make airport.

Narrative: I recognized that fuel calculations/usage was incorrect and elected to make a precautionary landing on a clear straight road with control rather than proceeding the 6 miles over housing to airport. While this situation is 100% my responsibility there are a few factors that worked against me in the lead up to this situation.1. Aircraft was 'rushed' out the door by [maintenance facility] due to pressure from aircraft owner. This was due to the [maintenance facility] taking a far longer time to repair than originally quoted. The aircraft underwent an annual inspection however I was never informed that they had changed the EDM930 engine monitoring system. Fuel tanks filled at [maintenance facility].2. Departed VFR with the possibility of weather closing in. After 30 minutes flight time aircraft started a pronounced right roll that had to be held off. Elected to land at [at a nearby airport] due weather and to inspect aileron roll problem.3. [The maintenance facility] found the right aileron linkage jamb nuts loose and vibration was pulling out of adjustment. Adjusted 3 full turns and tightened these nuts and flight the next day was improved with only slight correction required. **Should have filled tanks [there] as I had no weight and balance restrictions**4. Submitted my flight plan trusting the EDM930 fuel flow results of 6.5 GPH. Not sure why I believed this figure however the EDM930 has always been VERY accurate. I did not know at the time that the [maintenance facility] had messed up this unit. Departed with sight gauges reading 3/4 on the ground and full in flight.5. Inflight I noticed the EDM930 reading 35% power and started to mistrust this unit. After referring back to the wing tank sight gauge I noticed it quickly moved from 1/4 tanks to Empty. Diverted my plan towards [a nearby alternate] and notified ATC that I had a fuel problem.I continued flight towards [the alternate] and had landing clearance. Engine started to run lean and rough. Notified ATC of location and landed with power and control. [ATC assisted with services required]. I refueled [and continued uneventfully].

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1479090
Time
Date	201707
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Decathlon 8KCAB
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Monitoring System
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 10 Flight Crew Total 370 Flight Crew Type 74
Events
Anomaly	Aircraft Equipment Problem Less Severe Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Inflight Event / Encounter Fuel Issue

American champion 8KCAB pilot reported executing a precautionary landing on a road after realizing the engine monitoring system fuel indications were incorrect and fuel was inadequate to make airport.