Majority of Japanese people use kerosene heaters in winter. Using a kerosene heater is cheaper than using an electric heater as a cost for kerosene is cheaper.
People buy kerosene at a gas station, and when they buy it they need to bring a tank. When they put the kerosene from the tank to the tank of the heater, a pump is used.
When I was a child there only was a basic type of pump which we can now buy very cheap. But now there are many kinds of pump and the price varies. Some are what you still need to use hands to pump, but some are not as those pumps kerosene elestricity which is nice.
When you come to Japan in winter, you can see many kerosene pumps sold everywhere.