I agree with CNGBiFuel that it is highly unlikely that the cng tank would leak. If it be due to corrosion it would probably explode but that kind of material deterioration probably should not happen to such extent and so quickly between two official inspections.
Saying that, I did experience gas leaks from the system and it was related to pressure regulator's outlet port. The pressure build up was such that I could smell the gas which was accumulated under the bonnet over night and I could pin point the leak by carefully sniffing around the engine bay. Those types of leaks are more or less pretty easy to detect.
If it is the case of smaller leaks, than spraying soapy water over connections, joints, hoses' clamps is the best way to detect them, as already suggested by CNGBiFuel.
I resolved my gas leaks by a pressure regulator overhaul which was done in Netherlands by a professional. The car has over 200000 miles on the odometer so I guess it was never done before. Regardless of some initial design flaws of the system, I really have to admit that I never heard of a factory or aftermarket CNG/LPG system which lasted that long without regular maintenance and I got the car just when it had 20000 miles less. These older Volvos are sturdy beasts and so are their bifuel systems.
|