THE PILOT REPORTED THAT 1 TO 2 OUNCES OF WATER WAS DRAINED FROM THE LOW POINT FUEL SUMP, BUT NO WATER WAS DETECTED FROM THE OTHER SUMPS. HE STATED THAT HE DRAINED THE SUMP UNTIL NO WATER WAS DETECTED. DURING THE FLIGHT, THE ENGINE SURGED TWICE, THEN LOST POWER MOMENTARILY. IT WAS RESTARTED, BUT A SHORT TIME LATER, IT STOPPED AGAIN AND COULD NOT BE RESTARTED. REPORTEDLY, A FOUR LANE HIGHWAY WAS THE ONLY SUITABLE LANDING AREA. DURING THE LANDING, THE PILOT ATTEMPTED TO LAND IN A CLEAR SPACE BETWEEN THE VEHICLES ON THE ROADWAY. HOWEVER, THE AIRCRAFT STRUCK A CAR, THEN WENT INTO A DITCH AND NOSED OVER. THE CAR STRUCK THE ROAD EMBANKMENT, AND LATER, THE DRIVER DIED. WATER AND MUDDY RESIDUE WERE FOUND IN THE MAIN FUEL STRAINER AND CARBURETOR. WATER WAS ALSO FOUND IN THE FUEL FILTER FOR THE UNDERGROUND FUEL STORAGE TANK AND THE TRUCK-MOUNTED PORTABLE FUEL TANK.