Cass, run the vehicle until the tank is nearly empty. Pull the fuel pump relay and try to start the engine to deplete any fuel pressure in the lines. On this vehicle, you may be able to loosen two bolts for the straps in the center of the vehicle which will lower the tank enough so that you can unsnap the fuel line connectors from the top of the pump. I assume you are familiar with the quick disconnect fittings. The fuel lines will be plastic and the tank is plastic (HDPE). You are going to need a special tool to remove the plastic locking nut. Maybe AutoZone has it on their loan-a-tool program, or you can just buy one from Amazon, E-Bay, or possibly your local parts store. On some of these vans, it is possible to support the tank while you remove the 2 strap bolts, lower the tank, remove the locking nut, and swap out the fuel pump module without removing the tank.