Cook the elbow macaroni according to the package directions.
Drain the macaroni thoroughly.
Allow the macaroni to cool slightly before combining it with the remaining ingredients.
In a large mixing bowl, combine the chopped hard-boiled eggs, chopped celery, diced onion, sweet pickle relish, and chopped red bell pepper.
In a separate small bowl, combine the Miracle Whip, yellow mustard, white vinegar, white sugar, celery seed, salt, and black pepper.
Stir until the dressing is smooth and fully combined.
Pour the prepared dressing over the egg and vegetable mixture.
Stir gently until the ingredients are evenly coated.
Add the cooked and cooled macaroni to the bowl.
Stir gently until the macaroni is evenly combined with the dressing and vegetables.
Cover the bowl tightly.
Refrigerate for at least 1 hour before serving.
Before serving, stir the salad gently.
Taste and adjust the salt and black pepper if needed.
Serve chilled.