Abstract: A cartridge-type pump particularly adapted for aircraft or rotorcraft fuel systems incorporates a pump housing which is mounted in a wall of the fuel tank, which housing defines a cartridge pump cavity and a fuel inlet and a fuel outlet. A cartridge-type pump is received in the pump cavity with ports which communicate with the inlet and the outlet. The inlet is provided with an inlet valve which is normally biased to the closed position and is retained in the open position when the pump cartridge is seated in the pump housing so that upon removal of the cartridge, the inlet is automatically closed preventing loss of fuel from the tank. The cartridge is provided with a handle which, in a stored position, operates the inlet valve and which also serves to cam or lift the cartridge out of its seated position and which also operates to cam or force the cartridge into a seated position when the cartridge is being re-installed.