So I went to add Techron to the wifeys Flex and it has a capless fuel tank. It takes quite a bit of force unless you have the perfectly shaped thing (like a filler at a gas pump). I jammed a bit extension in there and poured in the Techron, but it looks like half of it ended up on the ground. Anyone have one of these capless fillers and put in fuel additives? I am thinking about jamming a funnel down there which is what I probably should have done in the first place...