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Cook pasta according to package instructions.
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Heat oil over medium-high heat. Remove casings from sausage and brown in oil, crumbling it as it cooks. Add onion and bell pepper and sauté until tender.
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Melt butter over medium heat. Whisk in flour, cook for 2 minutes, whisking constantly. Remove from heat. Add milk, stirring with whisk. Return pan to heat; bring to a boil. Cook until thickened, about 3 minutes. Remove from heat and stir in pepper to taste. Pour over sausage mixture and stir well.
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Preheat over to 350.
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Coat a 9 x 13 inch baking pan with spray oil. Spoon sausage mixture into manicotti and arrange in a single player in dish. Spread pasta sauce over top of manicotti and top with cheese. Bake for 30 minutes or until cheese is melted and bubbly.