Aloha Frank,
I concur with Randall and Geo. The seal is available as part of TRF pump rebuild kit. If the old one in the pump isn't chewed up you can leave it in place if your kit doesn't include that part. Most replacement pumps do not come with a seal installed. Like Geo, the fuel pump failures I've experienced were the pivot pin falling out on replacement pumps. The pin is a press it, not held in by cotter pins like the originals with priming handles.