@sohail bhai, its posssible, but sum wire has to be removed from the button
@shahzadbhai, mayb wat u are saying works with the FF cng models, but i have Local Cng LandiRenzo, in our baleno i had tried ur method but as the i turnd the key to start it reseted, nd went back to petrol.
once my cars fuel system had been faulty, so i had to do this the mechanic removed sum wire, i forgot.