Martha Is Dead

Chapter 4: the Room. Once you go outside you will see your bicycle next to the house. Interacting with it starts a quest. The pump can be found on one of your parents' bicycles. Go back into the house, turn left and walk through the hallway past the room with the coffin. Outside in the little patio there are two bicycles on the right against the wall. Interact with them to pick up the pump. Now head back outside and interact with your bicycle to fix it.