1984 35hp Mercury problem

[HTG]

This engine is cutting out or isn't able to suck the gas in when I put it in full throtle. I can put in full throtle and it will go about 30 yards and it will suck the gas out of the hose and just cuts out. Does anyone know what needs to be adjusted or fixed with this problem? I've tracked this down to the fuel line before but this time its happening to often so I think its something else, but I'm not sure what needs to be fixed. Anyone been down this road before?

 

[3rdtimesthecharm]

Gas tank vent.

 

[roscoe]

Leak in fuel line, sucking air.
Weak/ torn diaphragm in fuel pump.
Plugged fuel pickup in tank.
Fuel inlet in carb partially plugged.

 

[HTG]

Thanks for the tips, I will check again. If this isn't a fuel line problem, does anyone know what will need to be adjusted on the engine? I have the carb screw pretty loose because it starts easier, I'm wondering if that has anything to do with it. I'm going to tighten it and see what happens.

 

[HTG]

I think roscoe maybe correct. Does anyone know where I can get a fuel pump diaphragm for this engine?

 

[HTG]

This ended up being a plugged fuel line. Thanks to roscoe and Chris1956 you both nailed it.