Hi I'm trying to set the correct float height since I renovated the carbs. But the thing is I don't seem to get any wet level to measure, I'm guessing, just guessing since I don't have a perfect fit nippel, air gets in and somehow f*cks it up. Or the pvc-tubing is to long. I don't really know. When I open the drain with nothing connected it flows as it should. But when I'm connecting the pvc-tubing it just fills a bend (se illustration) and then stops? I'm gonna try and find something that is a really tight fit for it, but whats the expertises verdict?