Venting issue w/outboard and internal gas tank

[pjwalleye1]

I recently bought a 1993 Yarcraft 1781BT tiller boat with a 2006 Merc 60HP 4-stroke EFI and a 29 gallon internal gas tank. The motor will start fine and run fine at half to full throttle, but if I start trolling at idle speed, after several minutes the engine will start to starve for fuel. The gas bulb will be void of gas, I'll try to pump it several times, but the motor will eventually kill. The only way to work around this is to take the gas cap completely off (located on the bow), then the engine will work fine. I checked out the vent hose located in the back of the boat and it seems fine.

Any thoughts on how to rectify this venting issue? Thanks in advance.

[pjwalleye1]

duplicate

[dukhntr]

Sounds like your fuel is sloshing and closing the vent tube. Maybe you could splice the vent line and vent it toward the bow. On my C'liner, the vent and gas fill are near the bow.

dukhntr

[boatfixer]

Are you able to blow air through the vent hose? Insects can get in there nbd plug things up.

[lumpy]

I've had a Yar-Craft (98) for several years and placed several calls to the factory, with good responses back. Look up their number on the HSOforum and give them call. I know my tank gurgles back and have trouble filing it up completely if the bow of the boat is level, works much better if it is higher. The factory or a good dealer should have some answers for you.

I would recommend taking a look at the gas hoses if you can open up the battery compartment enough, so you can see that no hoses are pinched and also can tell the rep how everything is situated.