Is there any picture diagrams on which hose hooks up to which fitting on the carb. Of my weedeater? Seems like the hoses are made for specific size fittings and I can not put the small hose on the larger fitting and the larger hose will just fall off the smaller fitting. Also, my old tank had a small green one way valve on the inside nipple of large hose. It was broken and the new tank that came with lines did not have this on it. Is this a nessasary item? Cann't seem to find a simple picture of how these lines hook-up. Seems like it should be pretty straight forward, but does not work as I have hooked it up.

The line with the weighted fuel filter goes to the inlet on the carburetor and should be the smaller of the two lines, the larger one is the return line from the primer to the fuel tank. I hope this helps. Good luck