Actually, I'd have liked to rebuild the old pump, but a new one wasn't bad... $50. I think the rebuild kit would be around $20 even if it were available, so that's not too bad for a brand new pump. When I go to replace it, I'll have a look at the old one to see if it's just a generic bad gasket or something, but having seen the exploded view of the pump, I'm betting either the valve springs or the itsy bitsy valves themselves have gone bad (given where it was sputtering out gasoline)... Those parts were included in the old rebuild kit!
Also, I'd say the fuel pump is not strictly a "Gravely" part; it's whatever works with the Kohler 241 (10hp) engine.