A pumper truck is a truck with a large tank and the capability to pump liquids or slurries into and out of the tank. Pumper trucks are used in a number of industries and settings, with the most famous example of a pumper truck probably being the pumpers used by fire crews when they respond to a fire. These trucks can be quite costly, especially when they are purchased with all the options, and they are a specialty item which is often manufactured to order, rather than being kept in stock by a manufacturer.

Residents of rural areas may be familiar with pumper trucks used for septic clean outs. This type of pumper can be connected to a septic tank to remove the septic slurry, and the slurry can later be discharged at a facility which can process it. Similar septic pumpers are also used to service portable toilets such as those kept on the grounds of construction sites and concert venues.

Pumpers can also be used to transport fuels such as gas, oil, and so forth. Fuel delivery is typically accomplished with a pumper, and the truck can vary in size considerably. A large tanker truck may be used for something like gasoline, while a local gas company might use a smaller pumper to make gas deliveries to customers. Fuel pumpers have to be built with special care because they can be highly dangerous if they are not constructed and operated properly.