[Gerry Zagorski]

I would start by first trying to determine where the issue is....Could be bad gas in your tank, the fuel delivery components of your boat (tanks, fuel lines, fuel filters, vents, pick ups etc) or the engine itself.

First thing I would do is try and run your engine directly off of a portable tank. If it runs fine then you have eliminated any engine issues and it has to be something in the fuel or the fuel delivery components of your boat.

Take the portable tank and rather then hooking it up directly to the engine, take the line that comes out of your tank an introduce the portable tank there. If once again the engine runs fine, you have eliminated that the problem is being caused by upline fuel lines, primer balls, filters etc and the problem now lies with bad fuel in your tank or one of the tanks components like the vent or pick up.

Easiet way to elimiate the vent as an issue is to leave your fuel fill open and see if that resolves your issue. If not then it's the fuel in the tank or the pick up and these issues are better left to professionals who can filter and or dispose of bad fuel.