[I]Take it to some CNG workshop, or if she brand new from Suzuki it shall be attended within Warranty. If the kit is freshly installed or 'Serviced' (messed with) by Open market Installer has to attend and take care of it FREE.
its Highly dangerous it is just like gas leaking from your oven in the kitchen, and spark or flame............ Its ' BHOOM ' - Do it Now Do It Today, Drive car to CNG workshop with windows OPEN .... ! Allah keep you safe.
most likely the filler valve need replacement of rubber seals.[/I]