SMA FLOAT PLANE MAKES EMER FORCED LNDG ON THE TUNDRA; OFF ARPT LNDG. PLT SUFFERS MINOR INJURY. EMOTIONAL TRAUMA AND FATIGUE.

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I BELIEVE A FUEL LINE PROBLEM CAUSED THE ACCIDENT; CAUSING ME TO LOOSE PWR. I HAD EARLIER ADDED 25 GALLONS OF FUEL TO THE ACFT PRIOR TO DEPARTING TO AN ADDITIONAL ESTIMATED 5 GALLONS ALREADY ON BOARD THE ACFT; MAKING THE TOTAL FUEL AT DEP OF 30 GALLONS. THE FUEL WAS CLEAN AND FILTERED. DID FULL PREFLT INSPECTION; WT AND BAL. LOAD WT ON ACFT WAS 50-60 POUNDS OF PERSONAL GEAR AND 138 POUNDS OF MOOSE MEAT. DEPARTED ANOTHER GOOSE LAKE AT PM45 FOR DOUGLAS LAKE. FLEW VFR ALONG W SLOPE OF ALEUTIAN RANGE. VFR CONDITIONS WERE VARIABLE FROM 3 MI TO 25 MI VISIBILITY. CEILINGS FROM 2800 FT TO 800 FT AGL. FLEW ALONG RTE FOR APPROX 125 NM; ENCOUNTERED LOW CONDITIONS (1-3 MI VISIBILITY). DID NOT ENTER LOW CONDITIONS; CIRCUMNAVED W APPROX 30 MINS; CONDITIONS DID NOT IMPROVE. I DECIDED TO TURN BACK TO KING SALMON TO CANCEL MY FLT PLAN WITH MY WIFE UNTIL CONDITIONS IMPROVED. BEGAN NAV FOR KING SALMON. AT THAT POINT; ENG BEGAN TO RUN ROUGH. I SWITCHED TO MY FULLEST TANK (R) WHICH CONTAINED APPROX 1 1/2 HRS OF FUEL. I OPENED CARB HEAT. ENG CONTINUED TO RUN ROUGH. ENG RPM FELL OFF TO 1700 RPM. ROUGHNESS INCREASED. WORKED CARB HEAT LEVER; FOUND TO BE FUNCTIONAL. NO POSITIVE EFFECT ON ENG. PRIMER; MIXTURE CTLS ALL OK AND SET PROPERLY. ENG PWR DECLINED STEADILY UNTIL FINAL LOSS OF PWR. ATTEMPTED RESTART; NO GO. I WAS UNABLE TO GLIDE TO ANY NEARBY LAKES SO I PICKED A SMOOTH SPOT ON A CLR PATCH OF TUNDRA. AN ABRUPT HUMP SHEERED THE CTR SPREADERS ON THE FLOATS CAUSING THEM TO BUCKLE. THE ACFT SLOWLY LEANED L AND L WING CONTACTED THE GND CAUSING A SLIGHT BEND. ELT DID NOT ACTIVATE. I LATER ACTIVATED IT. I BUMPED MY HEAD ON THE SKYLIGHT AND WAS STUNNED AND DISORIENTED FOR A WHILE. A SPENT THE NIGHT AND REST OF THE NEXT MORNING WITHOUT SLEEP. I WAS ALSO COLD AND EXPERIENCED EXTREME ANXIETY AS WELL AS FATIGUE.