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I just replaced my rear fuel tank, brand new tank and pump. I know the fuel lines were a pain to get off even using the correct tool( trucks almost 30 years old). When I put in the new tank I was unable to get the fuel lines to snap on. So after an hour or more of trying and trying (even tried soaking with penetrating oil). So I guessed maybe they don't click on, and just used the clips. Now the truck won't get gas from the rear tank, but I can hear the pump running (front tank works fine). Do they have to click in to build pressure, or could it be something else.