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I fixed that problem the first time I had my tank off. I extended the lines and added marine fuel line quick disconnects. They work like air hose couplings. Now I don't have to tinker with that stupid return fitting or the supply side either. I just pick up the tank, reach underneath and pop them free. They're self-sealing on both sides so it's a drip free process and the tank doesn't spew if there's gas in it.