The header tank does not look like anything supplied by Kitfox. All of the header tanks supplied by the factory I have seen, plastic or aluminum, have three fittings on the top of the tank all pointing straight up, one in the center to bleed the header tank of air/vapor and one on each side of the bleed fitting to receive fuel from each wing tank. Honestly, the header tank in the photo looks like some adaptation from somewhere else a previous owner may have replaced the often drooling original plastic header tanks with. The one in the photo captures air/vapor in the top with no way for it to exit. Best fix is the current model aluminum header tank supplied by Kitfox and route the tubing exactly as the manual shows.