97 GTI Vent Problem

[KeithMock]

I have been having issues with my ski bogging down. Figured out it runs great if I leave the gas cap off so, I assume there is a problem in the tank vent system? I see there are two (2) hoses that run out the hull on the starboard side. One is grey, the other clear. The grey one goes to a T-fitting after which one hose leads to the tank and the other the side of the hull further up behind a black body panel. My question, is this the tank vent line and what is the likely issue? I doubt the hoses themselves are plugged so I am thinking one of the fittings in the hull? How do I check them? I assume they are one-way valves? Looks like the side panel is held on by a couple screws/bolts and can be removed with a little effort to reach the end of the grey hose that goes there.

Thanks for any help/thoughts.

 

[mikidymac]

The one that goes up is the vent that allows air into the tank. It is a simple check valve that lets air in but not out. The one that goes to the side of the hull is typically a pressure relief that pops at about 3 psi to let excess pressure out but not water in.

The clear one is not a fuel vent, it is typically the battery vent.

 

[KeithMock]

I'll try and pull the side panel and get at the valve. I have to figure it's plugged?

Thanks.

 

[KeithMock]

So I checked the hoses. The vent is fine, pressure relief valve doesn't pass air but that shouldn't prevent the tank from venting. One stange thing, when I blew on the hose that leads to the tank, I heard the gas bubble? That doesn't seem right since the system can't vent through the gas, right? Any ideas?

Thanks.

 

[mikidymac]

Make sure all you hoses are on the correct tank fitting, they are labeled on the pickup.

 

[KeithMock]

OK. I never had this problem in the past and have not removed the hoses from the top of the tank. Very strange.

Thanks.

 

[mikidymac]

I have had them bubble when the tank was full too, it vents through a small hole on the baffle.