Join Date: Jul 2000
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Can''t help you with a source as I live on the West Coast. However there are some things you should know about CNG.
The system on my boat uses CNG. The system max pressure is 2200# when the bottle is full. Automobile CNG which is more available, uses a system pressure of I believe 3300#. I know it is quite a bit more pressure than the bottles on my boat are rated for. Because of this difference in system pressures, the bottles use a different fitting. i.e. the Marine CNG bottles won''t just connect to an automotive CNG source without an adapter of some sort. This is to prevent filling a bottle tested to withstand 2200# to the much higher pressure of 3300# which could turn the bottle into a potential bomb during filling or if struck by something hard.
Marine CNG is rather expensive, about $25 a bottle here in Calif. However it does last for quite a long time. Because of the high cost, some boaters have converted to using the automotive sources for a refill (about $5 a bottle) but have switched to higher rated bottles ($$) or keep the pressure down to 2200#. You can find adapters if you look around the internet. I saw one for around $130 which might be justified if you can''t find a source or will use a lot of CNG!
The other option is conversion to LPG but that can get expensive also and does not afford the safety provided by CNG. i.e CNG will not settle in your bilge and become a potential bomb.