Fuel Pressure Emulator FPE, duplicates the correct petrol pressure in vehicles powered by LPG or CNG. While the vehicle is powered by gas, there is a lack of fuel intake from petrol rail and the petrol pressure rises above the base value. Because of that, petrol ECU shortens injection timing and/or reports an error. FPE type EMULATOR should be used to avoid the error report. FPE EMULATOR is necessary in following types of vehicles: Ford: Escape 3.0 V6, 2007 Explorer, 2004 F150, Jaguar X-Type 2.5i V6 24v Multipoint '02 XB (OBD), Jaguar 2,5l and 3,0l, Mustang 4.0, Volvo 5cyl. 2.4l Fuel Pressure Emulator FPE is also compatible with other types of vehicles, not mentioned above, with fuel pressure sensor in petrol rail (mostly Ford group engines).