Caravan Gas Regulator Problems? – A Summary of The Potential Issues


Hi, I’m Chris, I run Horton Common along with my father Robert.

Being the owner of a small caravan site I often have guests discuss with me the various issues they may be experiencing with their caravan or motorhome. Today, I’m going to discuss some of the potential issues you may be experiencing with the gas regulator in your caravan or motorhome. This post is not an endorsement for you to carry out DIY work on your caravans or motorhomes gas system. The purposes of this article is so you can make your GasSafe registered engineer aware of the potential issue so they can resolve it. Though the issue may be with the gas regulator on your caravan or motorhome, that may not actually be the original cause of the fault.

Caravan Gas Regulator

Is your caravan gas regulator really the issue, or does the true fault lie elsewhere?: Image – Amazon

What I would like to emphasize is that annually you should be having your caravan serviced. During that service, gas pressure tests will be carried out. That test would likely identify issues with the caravan gas regulator. This post is broken down under a series of sub-headings. You can use the Table of Contents below to jump to any particular section. However, if you do have the time its best to read the post as a whole. That will give you the best understanding of what the potential issues with your caravan gas regulator may be.

Introduction to Caravan Gas Regulator Issues

First, I better briefly describe what a caravan gas regulator actually does and how it works. The pressure and flow of gas straight from the LPG bottle unregulated is much higher than the appliances in your caravan require. Therefore the regulator’s job is the reduce the pressure of gas leaving the LPG bottle. Before the gas reaches your caravans hob, cooker, water heater or fridge. Previously on caravans before 2003, gas regulators were fitted to the bottles themselves. Some caravanners choose to use butane or propane. Each has its own pros and cons which I’ll cover in another post. After 2003 the gas regulator was installed into the caravan front locker its self. You simply have what’s called a ‘pigtail’ flexible gas pipe from the caravan gas regulator to either a propane or butane gas bottle. However, this is when a new issue started to occur:

John from Practical Caravan describes how a faulty caravan gas regulator could actually be caused by the flexible pigtail gas pipe.

John does a very good job of clearly and succinctly explaining the potential issue. While the caravan gas regulator may be affected by this issue, its not actually the cause of the gas blockage. I’ll now summarise John’s points below along with a few of my own comments.

Caravan Appliance Gas Blockages

You may start to become aware of potential issues with the caravan gas regulator when your appliances start to underperform or stop working altogether. The appliances in your caravan which use gas include your hob, cooker, fridge, hot water heater and space heater. Just a quick note, some caravan fridge problems as bizarre as it sounds may be due to your new tow car. Many people only use their caravans during the summer months and on a serviced pitch. Therefore its typically using either the hob or cooker when a caravanner will become aware of an issue with the gas system. You may start to notice a smaller flame and less heat being produced. This would obviously make you think, ‘oh the caravan gas regulator must have failed, its not getting enough gas through’. However, the issue may be a little more complicated.

As stated by John in the video above, the issue in several cases under further inspection has been due to blocked gas nozzles. An oily substance has been cleaned from the gas jets. This oily substance has also been found within the caravan gas regulator its self. Within a caravan gas regulator, there is a diaphragm and spring. The oily liquid blocks the diaphragm from opening sufficiently to let through enough gas. But what could possibly be the cause of this oily substance clogging up the gas jets? Well, it turns out the issue may be down to that short piece of flexible gas pipe linking the regulator and LPG bottle, the pigtail.

The Pigtail Problem

The source of this oily liquid substance which has been blocking up the gas jets on caravan appliances was traced back to the gas bottle pigtail flexible pipe. Under chemical analysis, it was found that the oily liquid contained what is called a plasticiser. The pigtail contains a plasticiser to keep the pipe suppler and flexible over time. What’s important to remember about the pigtail from the LPG bottle is that it carries high-pressure gas from the bottle to the caravan gas regulator.

Caravan Gas Bottle Pigtail

Your caravan gas regulator problems may be due to your gas bottle pigtail: Image – Amazon

If you have noticed, depending on the ambient air temperature around a gas bottle and humidity you can get condensation forming on the outside of the bottle. I won’t get into the ins and outs of why that happens with this post. However, whats important to note is when gas is stored under high pressure, condensation is a common occurrence. As the pigtail also carries high-pressure gas, it too at times is subject to condensation. And its the formation of condensation which can draw the plasticiser out the pipe. This oily plasticiser can then block up the caravan gas regular and other appliances.

How to Fix ‘The Pigtail Problem’?

Well, there are a couple of ways to address the issue of condensation and flexible pigtail gas pipes. However, if your pigtail has already created a blockage due to its denatured state, the gas engineer has got some work on his hands. The gas jets on the appliances will have to be cleaned and the gas regulator replaced. But to try and stop the issue reoccurring the following steps can be taken:

Positioning the Gas Regulator Higher Up

We now know the issue is due to condensation within the flexible pigtail gas pipe. Therefore, one method to address the issue is to position the caravan gas regulator as high up in the gas locker as possible. This way the condensation will drop down back into the LPG bottle. Now, this is easier said than done, and may not completely address the issue.

First of all, if you are using large LPG bottles that pretty much touch the top of your gas locker there is a problem. While the caravan gas regulator may still be higher than the bottle, the pigtail will likely loop down and then back up to the bottle. Hence, the condensation doesn’t fall back into the bottle, it sits in the loop of the pigtail pipe.

Don’t Use Overly Long Pigtails

You also want to make sure you don’t have pigtail gas pipes which are too long. You want them to be just long enough so you can connect the bottle to the caravan gas regulator. Therefore, if you change the size of LPG gas bottles you use in your caravan or motorhome, you also want to change the length of the pigtails to suit.

Change the Pigtail at Least Every Five Years

This only applies to the orange or black flexible pigtails, not the stainless steel pigtails below. All rubber-based hoses denature over time and become less flexible. This can actually also lead to gas leaks. I and my father recently noticed a smell of gas from within his caravans gas locker. After doing a gas pressure test which failed we looked to replace the orange flexible pigtail. After doing so we completed another gas pressure test which it passed. Hence to avoid issues with flexible rubber gas pigtails its best to change them at least every 5 years.

Have a Gas Filter Installed

Have a look in the front locker your caravan. If you don’t see a gas filter similar to the image below fitted next to the caravan gas regulator it may be worth asking your gas engineer to fit one. The filter should stop any potential plasticiser/oily residue going through the regulator and causing issues. However, you will have to remember to periodically change the filter or your gas system may again become blocked up. If you don’t already have a gas filter you could also consider putting your money towards a stainless steel pigtail gas pipe.

Caravan Gas Regulator Filter
If you don’t already have a filter fitted next to your caravan gas regulator you may want to ask your gas engineer to fit one: Image – Amazon

Use a Stainless Steel (SS) Pigtail to the Gas Regulator

Another method to avoid the issues of the plasticiser/oily residue issue blocking up the caravans gas regulator is to change to flexible stainless steel (SS) pigtail. I’ve actually got a flexible stainless steel gas pipe in my home. The gas pipe runs through various parts of the roof space, and I didn’t want issues with gas leaks. Therefore, I have a 20m continuous flexible stainless steel gas pipe which runs through my home. You now get short stainless steel pigtail pipes. And while yes they are more expensive the oily residue issue is avoided and so its the requirement to change the pipe at least every 5 years to avoid gas leaks. Its recommended changing a SS pigtail every 20 years.

SS Rubber Pigtail
This may look like a stainless steel pigtail, but its actually got a rubber lining: Image – Amazon

But you do have to be careful. When looking around the internet for stainless steel pigtails you often see ‘Stainless Steel Armored’. Don’t fall into this trap, this is just a rubber pipe with a braided stainless steel outer protective cover. What you are really looking for is corrugated stainless steel tubing (CSST). One of the few places I can currently find a fully stainless steel pigtail is GAS IT. They also produce a range of refillable LPG bottles which you may also want to consider at some point.

Conclusions on Caravan Gas Regulator Problems

Currently, this post just references the most prominent issue I’m aware of why a caravan gas regulator could fail. However, I will also update this post at a later date with a summary of other potential issues I can provide solutions for. What is important as referenced above is that you have your caravan annually serviced as the whole gas system will be checked for leaks and efficient combustion. Hence, any issues with your caravan gas regulator should also be picked up during that service.

I hope you learnt something new today, and if you do have a black or orange flexible pigtail which is over 5 years old I personally would look to get that changed. I also hope you consider coming to visit us here at Horton Common in the near future. šŸ™‚

Chris - Site Manager

Hi, Iā€™m Chris, I along with my father Robert we operate and maintain Horton Common.

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