I called the shop today to get an update. Neither Alex nor Preston was available at the time, so the person who answered the phone said they'd have one or the other call me back later in the day. Later in the day rolled around and Alex called and gave me an update. This is what happened, based on my understanding of what Alex told me. I think I have it down pretty well. First of all, for the sake of brevity and clarity, I'm going to use the following references: "Carb 1": The original carburetor that was on my engine when I bought the plane, and had probably been on there at least since 1997. "Carb 2": The carburetor that the carb shop in Florida sent back to One Stop Aviation instead of carb 1. "Carb 3": The carburetor that will hopefully be arriving at the shop at Harvey Field before long. "Fuel pump 1": The original fuel pump that was on my engine when I bought the plane, and had been installed about a year before I bought it. "F...