Salad - Bean Salad

1 can green beans
1 can wax (yellow) beans
1 can Kidney beans
1/2 cup green pepper (diced)
1/2 cup red onion (minced)
1/2 cup salad oil
1/2 cup vinegar
3/4 cup sugar
1 tsp salt
1/2 tsp pepper
1/2 tsp celery seed

Drain beans.  Combine with onions and peppers.  Mix vinegar, sugar, and spices.  Pour over vegetables and refrigerate for 8 hours before serving.