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If you don't decide to go with any of the aftermarket quick disconnects and don't mind the $1 max for another piece of stock fuel line then I found a real quick and easy way to go about it. Get two forceps, or small locking pliers, and pinch the crossover in two spots close together. The cut the line in between the forceps. You'll get a 1/4-1/2 oz of fuel that can be easily contained with a shop rag. Then take your tank over to what ever you are draining it into and release on of the forceps at a time and drain it. When you're all done put the tank back in place, replace the piece of fuel line and refill it.
Replace the oem crimp connectors with spring type connectors. It makes future removal much easier.
You can aim the disconnected fuel hose into a catch can or whatever you're using. Cover the tank stub with your finger. It takes a little time because the line is small, but it's not a hard thing to do. Do it to both sides.
You can buy plastic inline connectors from Motion Pro or similar knockoffs for $10-20 on ebay. Your call as to whether they are acceptable to you or not. These do not have check valves. When the connector is open, gasoline will pour out from both ends.
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