Now, take a 4" angle grinder and put a steel cup brush on it and clean the rust off of all parts that rub together (casing and impeller), wipe a thin layer of bearing grease on the surfaces that touch and put it back together. You don't need to replace the graphite packing rope because you are not worried about gasoline leaking around the shaft. Re-assemble all parts and you should be able to move the pump handle freely.