Landrover Discovery 2 / Defender TD5 Viton Rubber Fuel Pressure Regulator Repair Kit & Gaskets. Suitable for : all Discovery 2 (1999 - 2004) and Defender (1998 - 2007) TD5 Models. If your leaking diesel and its dripping off the bell housing or starter motor it could be your fuel pressure regulator seals are on the way out.