Just finished replacing my O rings on my fuel fittings. The hardest part was removing the black plastic retainer in the fitting. I used a paint can opener and it worked pretty well. Only problem I had was that when I pulled out the black retainer, it resisted at first, and then "popped" out, and flew across my garage. Luckily, I found it. Putting the new "O" rings in was easy. And, no fuel leaks after re-assembly.
Thanks for the write-up on this...it really helped...