What was found
VERIFIED COMPLAINT OF FUEL TANKS UNDER PRESSURE WHEN FILLED IN COLDER WEATHER THEN AIRCRAFT HANGARED IN WARMER TEMPERATURE AREA. FUEL SPRAYING OUT UNDER PRESSURE WHEN FILLER CAPS REMOVED. FOUND FUEL VENT SYSTEM LEFT, RIGHT PRESSURE RELIEF VALVES TO BE OPERATING AT APPROX 8 PSI, VERIFIED W/RAC TECH SUPPORT SHOULD BE OPENING AT 1.5 PSI TO .18 PSI. REPLACED PRESSURE RELIEF VALVE ASSEMBLIES. REMOVED VALVE ASSEMBLIES MANUFACTURED BY COMMERCIAL AIRCRAFT PRODUCTS. MFG CODE 440600 NOTED TO BOTH VALVE ASSEMBLIES.