Hamburger Chowder

3/4 cup diced onion
3/4 cup minced green bell pepper
6 tablespoons fat
1 1/2 pounds ground beef
4 1/2 cups sliced potatoes
3 cups canned tomatoes
4 1/2 teaspoons salt
5 teaspoons flour
3/4 teaspoon chili powder
1/2 cup cold water

Saut