Need Help

[kinglx1]

I have a 87 Mercury 115 it starts and idles great but if you run it at full throttle for about 20 minutes it will start sputtering and cutting out, has anyone had this problem before or have any ideal whats wrong with it. Thanks for any info

[CatFan]

Does the primer bulb still feel solid when it starts having problems or does pumping the primer fix it?

[kinglx1]

I put a new primer bulb on it still does the same thing so now i replaced the whole fuel line but i have not took it to the lake to try it out yet

[kinglx1]

I put a new primer bulb on it still does the same thing so now i replaced the whole fuel line but i have not took it to the lake to try it out yet

I have put 6 new coil packs in a new stator new plugs and had the fuel pump rebuilt and none of that helped at all

[NoMinners]

Is the new bulb staying hard?

[kinglx1]

yeah the one that i replaced last year was i have not been back to the lake since i replaced the whole fuel line

[sticko]

check the vent line off the tank it may be sucking closed or plugged up.

[CatFan]

Maybe something in the fuel tank is getting sucked up by the fuel pickup after running a while? I saw this happen once with the foil cap from a bottle of Stabil.

Does the problem ever go away without letting the motor cool off?

[ready2fish]

check the vent line off the tank it may be sucking closed or plugged up.

that would be my guess, clogged air vent

[kinglx1]

Maybe something in the fuel tank is getting sucked up by the fuel pickup after running a while? I saw this happen once with the foil cap from a bottle of Stabil.

Does the problem ever go away without letting the motor cool off?

No it doesn't Cat fan once it starts it just keeps getting worse unless you let cool down