1969 merc 40 fuel problems

[craigdaniel]

I have a 1969 Merc 40 1 cyl. the motor will crank and idle perfect. However once you throttle it up after about 1/4 to 1/3 throttle it dies. You can choke it right quick and it will catch back up then dies again. It will then crank right back up. I have put new gaskets, diaphragm and check valves in the fuel pump. I am running it off of the same tank and hose I use on a merc 110 that will run, so I don't think it is restricted there. I can not see any leaks in the fuel system. Any help or advice would be appreciated.

Thanks
Craig

 

[oldman570]

Re: 1969 merc 40 fuel problems

The high speed jet or passage way for the fuel is blocked in the carb and needs to be cleaned or rebuilt. JMO
Oldman570

 

[craigdaniel]

Re: 1969 merc 40 fuel problems

Thank you for the response, I have never worked on one of these carburetors how do I clean the passage . And how do I access it or does someone make a rebuild kit.

Thanks
Craig

 

[heycookieman]

Re: 1969 merc 40 fuel problems

Thank you for the response, I have never worked on one of these carburetors how do I clean the passage . And how do I access it or does someone make a rebuild kit.

Thanks
Craig

If you have a fuel filter check it to see if its blocked.

 

[oldman570]

Re: 1969 merc 40 fuel problems

A carb kit for your motor can be bought here at IBoats and a manual for your motor will have the steps to do the job in it. Buying both the kit and manual is advisable if needed.
JMO
Oldman570