LP Gas leaks and malfuntions
I recently had problems with my Cougar 5th wheel dual tank system. Low pressure from drivers side tank remote from the main two stage regulator. I could smell a faint odor of gas when I turned on the bottle. I replaced the remote high pressure regulator (18 psi) with a 30 psi regulator. I also replaced the hose on the remote side because I found that it was corroded and was malfunctioning.
I continued to have issues with low pressure from the remote side. Replaced the auto change over regulator on the passenger side and continued to have low pressure problems. After rechecking everything and not being able to really determine the problem, I took the entire system apart.
My 5th wheel has a gas pipe running across the front of the RV with brass fittings on both ends. The passenger side has a brass compression fitting on the passenger side and a brass reduction (1/2 to 1/4) fitting on the drivers side that connected the red single phase high pressure regulator. I found the reduction fitting on the drivers side had a crack in it which allowed gas to leak from the system causing the low pressure.
I took the pipe to a gas pipe and fitting store and they examined the fitting to find a replacement. Turns out the brass fitting was intended for use in water systems only and when screwed onto the pipe, it cracked from the pressure from the tapered threads on the gas pipe. I replaced the fitting with a steel pipe fitting (1/2 to 1/4) and a steel 1/4 inch nipple. I put it all back together and it works better now than it ever has and there is absoluty no gas smell. The crack in the brass fitting was letting off just enough pressure to make the auto changeover regulator not work properly and was not bleeding off enough gas so you could smell it at times.
I read many posts on different forums of people having this same problem. I did not see where anyone else had a bad or cracked fitting. Check your fittings to insure they are gas fittings and that the brass has not cracked and is the cause of the problem.
You may also want to check out this link:
MGC 5th WHEEL REMOTE CYLINDER LP GAS SYSTEM