It only splashes when full to the top and on the trailer and in the water.Its weird cause its not just a splash it is literally a pressurized spray back out of the vent and the filler hole. Sometimes can shoot a foot or two away from boat and all down side of boat and trailer.Then the gas station guy looks at me like im an a-hole and he could have done better. I also have one of those whistle things sitting on my bench but I need to mount it as close to tank as possible. Maybe a winter project to install it and see if it works.I was hoping for a quick fix..

Thanks Anthony

I wonder if the whistle thing creates an even more of a restriction in the vent line making the problem even worse?

I've had the hose off a the back side of the vent fitting before, no big deal. I've also thought that the opening of the vent fitting is to small in relation to the hose size when looking at it. The vent hose is big enough, just can't the air out thru the vent fitting fast enough, pressurizing the tank. Thinking out loud here

We have had 5 Fevers' and everyone of them would spray fuel out of the vent if you weren't paying full attention when filling them. One was particularly bad, it would spray out the vent no matter how careful you were, and then when you would pull away from the gas station, it looked like NASCAR pulling out of the pits with gas gushing out of the vent as you started off down the road! Our 35 Lightning twin step never sprayed any fuel out the vents (one fill and vent on each side).

I have to fill mine w/handle upside down also. Try it

I dont have the whistle installed yet so I dont think thats adding to my problem. I also think the vent line is to small just like you said.Thats why im trying to find where in goes into tank and how to reach it.I will try the handle upside down this saturday and see what happens.

Thanks for suggestions

I have seen people do this. I have the same problem so i will try it as well. But why would it help? I dont see the difference one way or the other.

Not all but most of the problem involves these stupid EPA fill pump handles for morons.

Notice when you use a fuel dock pump handle, the problem isn't as bad.

Mine has always done it as well. Just listen to the "swirl" sound coming out of the vent. Of course, if you're at one of those stupid frickin' stations where they have the constant talking advertisement going on like Shell, you're screwed because you can't hear the swirl sound over that stupid talking white coat asian bragging about an additive that doesn't do squat.