I have an 80's Mercury 50 that needs the carbs serviced. The serial number is 6307680. The boat runs great but fuel is leaking from them so I believe I just need the gasket set. The carb number is 1364-4929. There are two part numbers that come up. 1399-5198 and 1399-5199. Which would be best to get? The 5199 looks like a complete rebuild kit and 5198 is just gaskets. Because the motor is older I am having trouble finding someone willing to work on it in my area. I have a knowledgeable person that I can pay to do it with me but I'd like to find all the information I can. Anyone who has done this before- is there a guide, tutorial or book that would help me? Thanks in advance for all your help. -Danny 

Search how to rebuild Mercury outboard carburator (MarineEngine.com) looks like there is some specific help available. 

Tom

Google iboats 

I would try to find a service manual for the outboard. They can be a pretty indispensable resource. 

 

Where specifically is the fuel

leaking from?  

Iboats has service manuals & the forums are manned by mechanics & factory reps

16 hours ago, Ski213 said:

I would try to find a service manual for the outboard. They can be a pretty indispensable resource. 

 

Where specifically is the fuel

leaking from?  

Both carbs are leaking at the seal between the bowl and the main body. I had them rebuilt two years ago. I only have ethanol fuel available to me and even though I run stabilizer 100% of the time I suspect it has affected the seals. I have the Clymer manual for my year on order. I will look at iboats. Thanks everyone.