Forum Discussion

rfloyd99's avatar
rfloyd99
Explorer
Mar 05, 2022

Propane Regulator Issues

I may or may not have a faulty propane regulator on my 2016 TT. I bought the TT new, and have taken several months-long trips over the last six years. We took a long trip last fall, and when I was checking things out preparing for the trip the propane regulator seemed to be acting up. When I filled the propane tanks the problems (refrigerator wouldn't stay lit, stove burner performance was erratic) stopped, and we had no trouble during our month-long journey. 

I'm now getting ready for another long trip, and am having similar problems. Since my tanks were both almost empty, I had them filled, and the problems disappeared.

I'm planning to buy a new regulator so I'll have a spare in case the old one fails mid-trip. I have a few questions for anyone out there with more experience:

1. Had no trouble for the first five years of steady use, does it seem reasonable that I'm having trouble now? Do these things fail often?

2. When the tanks are full, the only problem is the stove burner has a lower flame if other things are using propane. Also, even without the WH or refr. on, using a second stove burner causes the flame level on the 1st one to be a little lower. Is that normal? Not a huge problem, but according to what I've read, the regulator should prevent this. Is it more evidence the regulator is failing? 

3. In shopping for a new regulator, they range in price from $38 to $70-80 to $100-120. Of course, I'm attracted to the cheap ones, but would like some advice as to whether that could be a mistake.

What say you all?

Thanks!
  • Bobbo's avatar
    Bobbo
    Explorer II
    Mar 06, 2022
    Almot wrote:
    I have Marshall MEGR-253. Red-green window is poorly visible but this is Ok. What is not Ok is that when one cylinder is empty, I have to go and flip the lever over to the other cylinder, manually. It never flipped over by itself.

    I don't have the Marshall, but mine doesn't flip the lever over itself either. If it did, the indicator would go back to green and you would not know that the first propane cylinder was empty. Mine does start drawing propane from the other cylinder so the propane appliances continue to function, but I still have to flip the lever myself.

    If what you are actually saying is that yours does not start drawing from the second tank until AFTER you flip the lever, then you have a defective regulator.
  • Almot's avatar
    Almot
    Explorer III
    Mar 06, 2022
    I have Marshall MEGR-253. Red-green window is poorly visible but this is Ok. What is not Ok is that when one cylinder is empty, I have to go and flip the lever over to the other cylinder, manually. It never flipped over by itself.
  • time2roll's avatar
    time2roll
    Nomad
    Mar 05, 2022
    joebedford wrote:
    My MEGR-253 regulator has failed but I can't find a replacement (except at 3X normal price).
    That is the one that came with my trailer. Hard to read and leaked for years before I noticed. Cavagna replacement is far better IMO.
  • joebedford's avatar
    joebedford
    Nomad II
    Mar 05, 2022
    My MEGR-253 regulator has failed but I can't find a replacement (except at 3X normal price).
  • C_Schomer's avatar
    C_Schomer
    Explorer
    Mar 05, 2022
    It sounds like the pressure is fluctuating but you won’t know for sure until you put a gauge on the system. You will also see if any of the flow devices are closing. I have several analog water column gauges but I still prefer to use a piece of clear Plastic tubing, at least 3/8” ID, and make my own water manometer… The gold standard for accuracy.
    I use a 25-year-old Marshall regulator and I move it from RV to RV, because it’s such a high quality.
    The newer ones are built super cheap so I wouldn’t try to scimpon one of them.
    I set the regulator to 11 inches at no load and I like to see at least 9” when everything is at high fire. Craig
  • Gdetrailer's avatar
    Gdetrailer
    Explorer III
    Mar 05, 2022
    Couple of things to check before you dump money into a new regulator and find that it doesn't fix the problem.

    Since most of your issues have been when tanks are near empty, temperature can play a role. Propane is stored under pressure as a liquid in your cylinder, your appliances however are designed to use propane vapors. Cold temps affect how quick the liquid can convert to vapor and when cylinders are near empty can make the process even slower. If both cylinders are low or out of propane there just may not be enough propane to work correctly especially in cold temperatures.

    Your cylinders also have a excess flow shut off built into the valve..

    Opening the cylinder valves quickly can trigger the excess flow valve to trip, when tripped you will still get some propane flow but not as much as there should be. Ensure you open the valves very slow. If you trigger the excess flow valve, to reset close the cylinder valve wait a few minutes and try again.

    Tripping the cylinder excess flow valve is common and easy to do by accident.

    Newer RVs also include special flow limiting "pigtails" which connect to your cylinders as a last defense in case the propane lines were to break or fail. Not sure if those autoreset if tripped..
  • ernie1's avatar
    ernie1
    Explorer
    Mar 05, 2022
    Unattract yourself to the cheap ones! Get a Marshall branded one and be done with it. You're probably getting oil into the regulator from the propane. After installing the new regulator, check to see you're getting 11.5 inches of water pressure.

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