What was found
FUEL LEAKING FROM BASE OF NEWLY INSTALLED PREMIUM FUEL CAPS. LOCATION ON WINGS IRRELEVANT. LEAK FROM BOTH IB AND OB CAPS. COMPLIED WITH MFG INSTRUCTIONS IAW VENT LOCATION WITHOUT EFFECT. EVIDENTLY NOT UNCOMMON PROBLEM, AS BLOGS ON MFG CLUB FORUM AND PILOTS ASSOC. FORUM WILL ATTEST. MFG SENT NEW O-RINGS, BUT HAVEN'T TRIED THEM. NEVERTHELESS, CAPS SHOULD BE FOOL-PROOF FROM FACTORY. HARDLY AN IMPROVEMENT OVER MY OLD MFG RAISED INLET CAPS.