15 hp johnson problem help

[stevefire05]

My 15 hp Johnson is running great, it cranks right up but after running down the lake a little bit it will die, pump the bulb on the fuel line it will fire up and run again, then die after a little run down the lake, if i keep pressure on the bulb it will do fine, help and ideas?????????????

 

[ben2go]

You have and air leak in the fuel line some where or the vent on the tank is shut.It could be the connectors at the engine or tank also.

 

[crazymanme2]

Sounds to me like your fuel pump is bad.Get a rebuild kit,cheapest way to go.(around $14)If you chose to rebuild it let me warn you there are a couple very small parts & springs inside & you have to exactly put everything back together right or it will not work.I'll see if I can find the link that has an exploed view of it.

 

[Tunnels]

I had the same problem with my 9.9 earlier. turned out to be the primer bulb. Check the hoses, tighten or replace clamps. look for the obvious & cheapest fix first.

 

[CarlF]

I would say it is one of the two problems suggested by others: Bad buld/air leaking into your fuel line or bad fuel pump.
There is also the possibility of a water in your fuel.

 

[stevefire05]

thanks i will look into it..

 

[ben2go]

You're welcome.

 

[cyberflexx]

Is there a diaphram in the engine that will cause the fuel not to be sucked into the carb? I remember my friend having to replace his but that was in a Nissan 15hp. To get the boat to run, he had to continually pump the bulb or it would die..

 

[Loggerhead Mike]

my pos sears motor has that diaphram. when it gets a hole in it most of the fuel blow's directly into the crank causeing the same symptoms as yours. im not sure if your motor has the same setup though