Dodged another bullet. I needed to get some gas for the Mustang today before heading to the track and I got some in gas cans. As a precaution I shined my flashlight in the tank just to see if anything was in there. Well I found all these rubber strips. It looks like they came from the sealing ring for the filler. There were enough of these jammed into the fuel outlet that I heard gurgling noises when I pulled them out. Now I get to pull my filters and maybe my pump to check for debris. I guess better here than at the track or on the road.
The last picture is some of the big chunks that were in the pre-filter.