timppa

Had the same problem in some of my previous Beta's and in current one. Earlier one was cured with longer breather hose re-routed. Current one was a bit trickier. I tried re-routing the longer hose, different versions, no succes. Then I tried without the yellow plastic part on the cap etc, even worse. Then I tried to understand what the cap is trying to do, I guess the spring actuated thing should be some kind of valve but it wasn't working right. Then I just drilled some small (1-1.5mm) holes around the plastic part, to act as a vent holes as the fuel seemed to be held in the cap by the valve thing and when it's full, it starts to spill out. Works fine, doesnt spill fuel anymore.