Bring a large pot of water to a boil, and add dash of salt. Add the potatoes and boil until tender, but still firm, or about 30 minutes. Remove, drain cool, and cut into thin slices. Cook bacon in a large skillet on medium high heat until brown
. Crumble the bacon and set aside. Reserve the drippings. Saute the onion in the bacon drippings until golden. Combine salt, sugar, celery seed
, pepper and flour in a small bowl. Add mixture to the onions and cook until bubbly. Remove from the heat. Stir in the vinegar and water. Bring to a boil, stirring constantly, boiling for about 1 minute. Slowly add the potatoes and bacon, stirring gently until the potatoes are cooked through.