[Rob175]

Well...after getting a P0446 code on my 98 Boxster a couple of months ago I replaced the old gas cap with a new one after noticing the o-ring inside the cap has some cracks.

After the old cap was replaced and the CEL code cleared, I drove the car for the next couple of months assuming the problem was solved since the CEL never returned....UNTIL TODAY. As I was driving to its "winter storage" location the CEL P0446 returned.

Question: Can topping off the fuel (beyond the gas station's fuel pumps "auto-shut off") cause fuel to mess with the evaporative canister and trigger a CEL P0446 ??

(note: About a week ago I topped off the fuel tank in preparation for its winter storage and drove it for about 30 miles afterwards)
(note: The new cap is an OEM cap)