Definitely the fault of the mechanic who worked on it. Surprised the shop didn't do a complete inspection of the fuel system after you had to bring it back for the previous issue.

Take it back to them to have it fixed! When you pick it up, ask if the mechanic who initially replaced the fuel pump is still employed there. If yes, ask them why.

What did they do about your brake issue? Did they say it was OK.

When I took auto mechanics classes at my local community college, most of the guys there ranged from pretty darn good to just OK. But there were some real idiots too. During my mechanical transmission class, we were taking transmissions apart and putting them together when I heard someone using a hammer on his transmission. Now these were transmissions that had been taken apart hundreds of times, and required no force to put them together. I grabbed the teacher, and asked if he would go inspect what the idiot was doing. Instead of "fiddling" with it for a minute to get the syncros to drop into place, the rock decided to try to hammer them in. Just hope that guy never works on one of my vehicles...lol