I do more engine swaps then anything else. Engine from a one mower to another. I find a lot of bazar problems .John Deere is metric and Craftsman is SAE ,one has electric clutch, bigger charging system. Briggs has a diode on each coil kill wire. Some have the fuel tank up high under the hood , so no fuel pump , fuel tank under the seat so this one has a fuel pump. So I will mention this from memory and imagination, There is a bracket that has two fixed nuts in it that bolts on with the shroud that will over come this problem and could be easily missed on assembly. At the same time I have seen so many of that pump just hanging with the hose .