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?

Asked by for the 2000 BMW 740i
It could be the fuel pump. You should take it back to the shop that did the work...