An LP gas evacuation system for evacuating LP gas from a vehicle fuel tank includes an inlet port for connection to an excess flow valve associated with the vehicle fuel tank to receive LP gas from the vehicle fuel tank, an outlet port for connection to a storage tank, and a pump coupled between the inlet port and the outlet port. The pump is operable to pump the LP gas from the vehicle fuel tank via the inlet port to the storage tank via the outlet port. The pump is a pneumatically driven displacement pump that can effectively pump both liquid phase LP gas and gas phase LP gas. The pump has seals formed from a material substantially resistant to degradation by contact with the LP gas. The LP gas evacuation system further includes a pneumatic pressure regulator configured to receive a supply of compressed air and to provide compressed air at a desired pressure to the pump. A housing of the evacuation system has a control panel including a switch to selectively supply the compressed air to the pump, pressure gauges to display LP gas pressure at the inlet port and the outlet port, and a sight glass coupled between the pump and the outlet port to permit visual inspection of the LP gas being transferred from the pump to the storage tank.