Mercury Classic 50 lower carburetor leak

[boat14]

Can someone tell me why when I run my newly acquired classic 50 Mercury motor, fuel will spill out of the port side of the air intake on the lower carb. like a steady stream filling the compartment with fuel and eventually leaking out all over my driveway. Is there an adjustment I can easily make or something I can check? Thanks.

 

[Wingedwheel]

Re: Mercury Classic 50 lower carburetor leak

You could have one or several problems. The float could be sticking in that carb which would not let the needle seat and stop the gas from overflowing in the carb bowl.(most likely). Do you know when the carbs were last rebuilt? Another problem and I've seen it a few times, is a broken reed valve. Chances are its in the carb and not the valves.

 

[boat14]

Re: Mercury Classic 50 lower carburetor leak

The boat has sat many years I think and that sounds consistent with what I've been reading. I had the top one rebuilt and thought the mechanic when running the motor after that would've picked up on any other problems. (that's why I thought I had it there) Thanks for your help.

 

[verado7]

Re: Mercury Classic 50 lower carburetor leak

insane that a mechanic would only do 1 carb - hopefully the fuel pump was done also ?

 

[pdreher]

Re: Mercury Classic 50 lower carburetor leak

I had that same problem on mine my floats were stuck open. To solve the problem I just had to rebuilt them, it is very simple to do yourself. Hope this helps.

 

[boat14]

Re: Mercury Classic 50 lower carburetor leak

I would love to do the work myself to make sure it is done right and not spend a fortune but is it a pain in the neck to remove the front block on the classic 50 mercury to access the lower carb? How much are the rebuild kits and where would I find one? Thanks.

 

[outboardnut]

Re: Mercury Classic 50 lower carburetor leak

It's not a bad job just takes time.

I would allow yourself 6 hours removal, rebuild, reassembly.

You could also do it the easy way, and hire it done.

 

[mercfixer]

Re: Mercury Classic 50 lower carburetor leak

Make sure that you install a new needle valve. In past years they had a rubber tip which would cause problems after time. The newer replacement is all stainless. There were two different manufacturers of the classic 50 carbs over the years, Tiltson, and Walbro. The manufacturers name will be on the castings. There are subtle differences in the two, but float setting, and air/fuel adjustments are the important ones. I have a few out back in my canal...........they DO wear out eventually

 

[verado7]

Re: Mercury Classic 50 lower carburetor leak

6 hours ? how much of the motor are you taking apart - should take an hour to hour and a half .

 

[mercfixer]

Re: Mercury Classic 50 lower carburetor leak

I made two wrenches to get to the lower, and with taking the starter off....my beer will be gone when they finish...........................

 

[huntxtrm]

Re: Mercury Classic 50 lower carburetor leak

Did both of mine inside of 2 hours at the lake, on vacation, with general tools i carry in my boat. Not that bad.