To replace the windshield washer pump, remove the washer fluid reservoir. Remove the rubber hose on the bottom of the reservoir from the pump. Remove the plug and wiring from the pump. Remove the reservoir from the car and then remove the pump from the reservoir and from of the rubber grommet. Next, use a screwdriver to pry the grommet from the tank. Your new replacement pump will come with its own grommet. Install it into the reservoir. Use a small amount of oil to lubricate the grommet. Finally, reinstall the hose and wiring harness by reversing your previous steps from when you removed them.