So here are my findings. As you can see in the photo, both seats have a 5/16 thread, but the one for the gravity feed motors has a larger orifice. This makes sense. It must be that the 12Hp needs even more fuel and requires the 3/8 seat when it is gravity fed.
To bring this back to the original issue, how does this all affect up pump conversions? I have not looked through parts books yet to see what was contained in the factory conversion kit, but I doubt that the seat would had been replaced, which would starve the motor of tank fed.
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