A C310 flight crew experienced power loss and rough running on both engines; resulting in altitude loss and track deviation. After landing; evidence of fuel contamination was found.

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Attributes
ACN	715131
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : zzz.vortac
State Reference	US
Altitude	msl single value : 7000
Environment
Flight Conditions	IMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : las.tower
Operator	general aviation : corporate
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	instruction : instructor oversight : pic
Qualification	pilot : atp pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 2000
ASRS Report	715131
Person 2
Affiliation	company : corporate
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

After approximately 45 mins on auxiliary tanks experienced fluxing fuel pressure. Left engine ran rough; changed to main fuel and boost pump on; no low fuel light. As left engine was coming back up; right engine started to fail. Changed to main fuel tank and boost pump on; right engine came up and power. Some altitude loss approximately 300-400 ft and some direction control approximately 1/2 mi from course. We were back on course in approximately 30 seconds. Cleared direct. No more fuel problems. On arrival at ZZZ and next day maintenance pulled auxiliary sump drains and found some 2-3 oz of muddy grit and water. Advised owner to have all sumps and screens cleaned.

Original NASA ASRS Text

Title: A C310 FLT CREW EXPERIENCED PWR LOSS AND ROUGH RUNNING ON BOTH ENGS; RESULTING IN ALT LOSS AND TRACK DEV. AFTER LNDG; EVIDENCE OF FUEL CONTAMINATION WAS FOUND.

Narrative: AFTER APPROX 45 MINS ON AUX TANKS EXPERIENCED FLUXING FUEL PRESSURE. L ENG RAN ROUGH; CHANGED TO MAIN FUEL AND BOOST PUMP ON; NO LOW FUEL LIGHT. AS L ENG WAS COMING BACK UP; R ENG STARTED TO FAIL. CHANGED TO MAIN FUEL TANK AND BOOST PUMP ON; R ENG CAME UP AND PWR. SOME ALT LOSS APPROX 300-400 FT AND SOME DIRECTION CTL APPROX 1/2 MI FROM COURSE. WE WERE BACK ON COURSE IN APPROX 30 SECONDS. CLRED DIRECT. NO MORE FUEL PROBS. ON ARR AT ZZZ AND NEXT DAY MAINT PULLED AUX SUMP DRAINS AND FOUND SOME 2-3 OZ OF MUDDY GRIT AND WATER. ADVISED OWNER TO HAVE ALL SUMPS AND SCREENS CLEANED.

Data retrieved from NASA's ASRS site as of January 2009 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.