It's not the fuel pump. It wouldn't run for 45 minutes if that were the problem. Those fuel pumps are very simple. They pump using the pulse of the engine. Not much to go wrong, especially a mower that new.
You'd be surprised how easy it is to replace that carb. It's removing 2 screws, the choke cable, fuel line and solenoid wire. Just reverse the process to install. Make sure the mating surfaces on the engine and carb are clean when installing. Use the new gaskets.
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