CNG Regulator Assembly

[jacksonlord]

Hey guys,

My CNG regulator assembly which attaches to the tank in the aft stateroom seems to be broken. When I connect a full tank, tighten the nut, and open the tank valve, gas leaks wildly around the nut. Here is a picture of my assembly: https://dl.dropboxusercontent.com/u/1772335/2013-10-08%2019.11.21.jpg

I think I need to replace the brass regulator in the picture. I'm guessing that it's clogged or something similar. That big brass piece is a "multi-seat" regulator from "Modern Engineering Co.", type P-I-DD. The grey piece is a Fisher Controls regulator type 912.

My first question is, why are there TWO regulators between the tank and the stove? The hose closer to the viewer in the picture is a vent, and the lower hose goes to the stove. Is the brass regulator just for the gauge? If I wanted to replace this entire assembly, can I just use a single regulator?

Here's a replacement assembly from Safgas: http://www.safgas.com/store/Boat-Stove-Parts/CNG-Boat-Gas-Regulator.html
Quite pricey, but similar configuration. Again, how does this work?

Thanks for any help!

-Jackson
San Francisco

[Ted Pounds]

I seem to recall that there's an O-ring at the connection to the tank.  Could that be missing?  Just a thought...  Good luck.