Im going to have to replace the seals in the gear case and was wondering if i should go ahead and replace the impellar while i was at it. the impellar was working the last time i had the motor started...working atleast enough to get the force "spray" should i just get a new impellar or impellar kit. i know its a good idea to replace the impellar each year however i was wondering if that meant just the impellar or the whole set up. any advice help would be greatly appreciated.