As you can see the fuel was in bad shape. Also the fuel pump strainer had totally disintegrated and, I believe, turned the fuel the yellow color. The process of removing the pump and removing the seat was not as bad as I thought it would be. Thanks to descriptions in the Forum I used a drill to move the seat track and got the seat out without too much trouble----even for an old guy!
Parts are ordered and I hope the fuel pump was the problem, along with clean fuel and a new fuel filter and strainer.