How to Replace a Mercedes Fuel Pump

1. Remove the fuel lines from the fuel pump by loosening the nut connected to the fuel pump and the one connected to the fuel line.
2. Unscrew the hex cap screws that attach the fuel pump to the rest of the car. You don't have to remove them, just make sure they're loose.
3. Pull up on the fuel pump lightly to remove. Pour any fuel remaining in the fuel pump into a container for recycling.
4. Clean away any grease or gunk around the edges of the mounting surface. Left over grease and grime will keep the new fuel pump from attaching correctly.
5. Install new gaskets on the fuel pump mounting surface before installing the new fuel pump.
6. Push up on the new fuel pump to attach it to the mounting surface.
7. Reattach the two fuel lines to the new fuel pump. Turn the key and pump the gas pedal a few times. It may take several tries to get the fuel flowing through the new fuel pump.