The victory takes the Devils in the last eight of the championship.
The superb performance included two goals by Javier Hernandez - which were also the first to goals of the match, followed by one each by Jones and Fabio.
The victory extended United's unbeaten run to six games and, despite some indifferent performances during that time, there does seem to be some momentum building after a stuttering start to manager David Moyes's reign.
Commenting on Javier's superb performance, Manchester United assistant manger Steve Round said: "Javier Hernandez is such a good character. I don't think [his lack of first-team action this season] has fazed him at all. He is a really infectious character who loves to score goals."
Commenting on Javier's superb performance, Manchester United assistant manger Steve Round said: "Javier Hernandez is such a good character. I don't think [his lack of first-team action this season] has fazed him at all. He is a really infectious character who loves to score goals."