Place bacon in a large, deep skillet and cook over medium high heat until evenly brown. Drain, crumble and set aside. Bring a large pot of lightly salted water to a boil. Cook tortellini in boiling water for 8-10 minutes or until al dente. Drain, and rinse under cold water. In a small bowl, mix together mayonnaise, sugar and vinegar to make the dressing. In a large bowl, combine broccoli, tortellini, bacon, raisins, sunflower seeds and red onion. Pour dressing over salad, and toss.