@shaan thank you for your reply.So if I want to change CNG kit to EFI one what all is suppose to change and how much should it cost?At the moment CNG gives me Rs1.6 per Km which I think could improve.
As far springs, I will definitely have them replaced when I next visit Federal Autos (I guess in early June).
Now the next problem I have faced couple of times is during start.In fact there are two different situations in which start becomes a problem.First if I have extracted work from engine for long (e.g. Prolonged AC use, Hill climbs in summer, loaded vehicle running for long etc) and I switch off engine;it wont start immediatley after (sometimes it starts on Petrol after 3-4 attempts but not always).Engine cranks but no start!(there is no over-heating and temp gauge lies in lower green section)After a cooling time of 1 min or so engine starts perfectly alright (CNG or Petrol). What is wrong?
Second situation happened only twice after first start attempted in the morning.Engine cranks with slight abnormal cranking noise (like if starter is not correctly engaged or something is slipping over).After 3-4 attempts engine does start but vehicle shivers at Idle RPM with a kind of hollow engine noise(somewhat like an old Suzuki carry with a screwed up engine)Shiver reduces considerably as RPM increases but noise stays abnormal(Oil quantity,light are OK).Run the vehicle for 1-2 km and it becomes perfectly alright with no sigtn of abnormality whatsoever.What is wrong?