OPEL SPX KENT-MOORE special tool. Fuel Tank Removal/Installation. (L) Fuel System and Exhaust System : Engine : Astra-G CNG : 1998. (L) Fuel System and Exhaust System : Engine : Astra-G CNG : 1999. (L) Fuel System and Exhaust System : Engine : ASTRA-G CNG : 2000.