the earlier 40.5's used CNG which does not present the hazard propane does. CNG is less dense than air making an isolated locker unnecessary. Consequently, the CNG tank was located in the aft std side cockpit locker.
I just bought this boat and it has been converted to propane it is a 20 lb bottle on the aft swim locker I would like to go to the port cockpit with the cooking gas you said it orignalally came with CNG where can and how do I obtain the gas
Ritch: We made a valve that allows us to fill our own tanks. We filled 4 tanks for about $2.00 each. If we use a local supplier they charge us about $25/bottle.
The valve cost us about $250 but it will not take too long to pay for itself.
Check out possible CNG fill stations in your area.
Probably the reason it got converted was because of the difficulty of finding a portable tank fill station for CNG. Local utilities no longer have filling stations and vehicle fill stations will not allow the use of adapters because of liability concerns. (CNG is safer than propane as it is lighter than air and tends to disipate but coming off at high concentration it is still explosive if ignited) There is plenty of CNG in the country as it is piped to homes and businesses but new boats are not being delivered with CNG systems and older ones are getting converted to propane so the marine user segment is dwindling and will one day dissapear so there is really no incentive for anyone to go into the CNG portable tank filling business. If the PO converted the boat to use a 20lb standart grill tank I would be a little concerned about the rest of the installation. I would urge to familiarize yourself with the components necessary for a safe propane installation 1) Sealed tank locker vented to the outside 2) Remote solenoid gas shutoff valve and 3) Pressure gauge to test system for leaks 4) regulator 5) single length propane hose and vapor tight fittings 6) stove thermocouple gas switches (CNG stoves can be re-jetted for use with propane but will lack the thermocouple valves which shutoff the gas flow if the flame becomes estinguished) In the early days we would have a propane tank sitting on the open deck (for ventilation) and the the tank valve was opened just for cooking and closed immediately after. The newer systems provide safety with the convenience we lacked in those days. Just some food for thought.
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