Hello, I'm new to the forum and new to boating. I have a Bayliner Capri with a 50 hp outboard Mercury. It is not pumping water and I've tried clearing the drain. I understand how to pull off the bottom end and replace the impeller. That's what I thought I would do next. The problem is the only numbers I can find on the engine is a tag that says: serial number 6308653. I don't know the correct impeller to order based on this ? I would appreciate any help.