Hi.
I bought Hyundai vehicle second hands. CNG kit is fitted with vehicle but it doesn’t endorsed in RC book. the CNG kits records also missing now. It’s illegal to use the CNG option without endorsement. The brand of CNG tank is "ECON" and the ISO symbol also in the tank. So I planned to endorse it.
1.how to get the required documents for the CNG?
2.How to know whether it’s a authorized CNG kit or local CNG kit?