Twist off the gas cap to release any pressure trapped in the tank, then let go of the tank pressure before starting work. Unplug the negative battery cable. When working on Civic models, take out the trunk carpet, then lift off the rear seat cushion and backrest. When you have this part, pull out the crossmember over the fuel pump access area. Loosen and remove the fuel access cover's screws. Then take off the fuel access cover. First, disconnect the fuel supply and EVAP quick-connect fittings, and save them somewhere. Then unplug the electrical connector for fuel pump/Fuel Level Sensor. To get the fuel pump/fuel gauge sending unit out, remove its locknut and carefully pull the unit from the tank, turning it slightly to avoid bending the float arm and float. When you find any problems with your seal, replace it right away. Take the plastic clamp off the fuel gauge sending unit's connection to the module, push the two tabs, and pull the unit out of the fuel pump module housing, being careful to not damage the float arm inside. Put the seal into the hole before sloting the fuel pump/fuel gauge module into the tank, to prevent any twisting or bending. Put the top mark of the fuel module between the marks on both sides of the hole while setting it in its position. Like removing it, reinstallation also involves screwing the module locknut until tight. To put the fuel pump cover in correctly, touch the negative side of the battery with a cable, turn on the engine, and look for any gas leaks where the pump attaches to its tube. Put the access cover in place, replace the carpet, and either fix the seat or slide in the seat cushion.