What was found
HEATER FUEL STRAINER CRACKED/CORRODED. WHEN FUEL VALVE TO HEATER WAS OPENED, FUEL POURED OUT INTO NOSE CONE SECTION. VERY SEVERE LEAK. PILOT IMMEDIATELY SMELLED FUEL AND SHUT VALVE OFF. HAD HE NOT, THERE COULD HAVE BEEN A FIRE AND/OR EXPLOSION. APPEARED CLAMPING NUT HAD BEEN OVERTORQUED. ALSO, FUEL STRAINER APPEARED NOT TO HAVE BEEN REMOVED AND CLEANED RECENTLY. SEVERE CORROSION. SKINNER PURIFIER FUEL SCREEN.