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you should be able to pinch the plastic part there with some pliers and pull that rusted tube out. all of them fittings should pinch and pull off the pump, even where the two tank lines exit the side of the tank to the frame lines. to reinstall, push the lines on and you feel/hear a click, then pull back to make sure its locked on good.
I had three quick connectors that were completely rotten and one that I was able to save after spraying them and handling them carefully. But on two of the connectors, the fuel pump pipe is so thin and rusted that I have nothing left to grab onto, so I don't think I can remove them. I've soaked them in vinegar overnight so that the rust can come off a bit, but I think I'll need new connectors.
Maybe a easy out from the inside can get enough grip to pull them out
