P008A after fuel filter swap.

Changed filers, replaced with Motorcraft as always. Apparently had the o-ring weird because it was seeping fuel around the frame filter and I got the P008A code. Dropped the filter, fixed the o-ring and got the same result. Dropped filter again, replaced the o-ring with a new one, everything is dry now but the code remains. Truck runs fine, no noticeable lack of power, no nothing wired other than this code.
Thoughts?