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Q: Hello, i own a 2000 BMW 740i,, My car just had a new fuel pump put in. on 2000 BMW 740i

I also had the gas tanks replaced with new ones.. although the car runs fine..Im hearing this irritating howling type sound from the car.. It constantly keeps howling whether im driving or long as the engine is running, its howling..what can it be.? Is it a major issue?
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