How to Fix RV Water Leaks in PEX Pipes: A Comprehensive Guide

How to Fix Leaking RV Water Pipes

Recreational vehicles (RVs) are a fantastic way to explore the great outdoors while enjoying the comforts of home. However, like any other vehicle, RVs can experience issues, including water leaks. One common culprit for these leaks is PEX (cross-linked polyethylene) piping, which is widely used in RV plumbing systems due to its flexibility, resistance to scale and chlorine, lower shipping costs, and ease of installation. In this blog post, we will explore how to fix RV water leaks in PEX pipes, referencing helpful YouTube videos and providing a detailed list of necessary parts, including their prices and links.

Understanding PEX Pipes

What are PEX Pipes?

PEX pipes are a type of plastic piping that has become increasingly popular in plumbing systems, including RVs. They are known for their durability, flexibility, and resistance to corrosion. PEX is an alternative to traditional materials like copper and PVC, making it a preferred choice for many RV manufacturers.

Advantages of PEX Pipes

1. Flexibility: PEX can bend around corners and obstacles, reducing the need for fittings and joints.
2. Resistance to Scale and Chlorine: PEX is less likely to corrode or develop scale buildup, which can lead to leaks.
3. Lower Shipping Costs: PEX is lightweight, making it cheaper to transport.
4. Ease of Installation: PEX can be installed quickly and easily, even in tight spaces.

Common Causes of Leaks in PEX Pipes

1. Improper Installation: If PEX pipes are not installed correctly, they can develop leaks over time.
2. Temperature Changes: Extreme temperature fluctuations can cause PEX to expand and contract, leading to leaks.
3. Physical Damage: PEX pipes can be damaged by sharp objects or excessive pressure.
4. Fittings and Connections: Leaks often occur at the joints where PEX pipes connect to fittings.

How Often Do I Need to Replace RV PEX pipes?

Identifying the Leak

Before you can fix a leak, you need to identify its source. Here are some steps to help you locate the leak in your RV's PEX piping:

1. Visual Inspection: Look for any visible signs of water damage, such as wet spots, mold, or corrosion around the pipes and fittings.
2. Check Connections: Inspect all connections and fittings for signs of leakage. Pay special attention to areas where pipes meet.
3. Listen for Drips: Sometimes, you can hear water dripping from a leak, especially if it’s a slow leak.
4. Use a Moisture Meter: If you have access to a moisture meter, you can use it to detect moisture levels in the walls or floors of your RV.

Tools and Parts Needed for Repair

To fix a leak in PEX pipes, you will need some tools and parts. Below is a list of necessary items, along with their prices and links for purchase.

Tools

1. PEX Cutter: A specialized tool for cutting PEX pipes cleanly.

• Price: $8.49
• Link: PEX Cutter
  
  
  

2. Crimping Tool: Used to secure PEX fittings to the pipes.

   • Price: $24.99
   • Link: Crimping Tool
     
     

3. Adjustable Wrench: For tightening fittings and connections.

   • Price: $12.99
   • Link: Adjustable Wrench
     
     

4. Teflon Tape: Used to seal threaded connections.

   • Price: $3.99
   • Link: Teflon Tape
     
     

Parts

1. PEX Pipe: Replacement PEX pipe if the existing pipe is damaged.

   • Price: $0.50 per foot
   • Link: PEX Pipe
     
     

2. PEX Fittings: Various fittings (elbows, tees, couplings) as needed.

   • Price: $0.75 - $2.00 each
   • Link: PEX Fittings
     
     

3. PEX Crimp Rings: Used to secure fittings to the PEX pipe.

   • Price: $0.10 each
   • Link: PEX Crimp Rings
     
     

Step-by-Step Guide to Fixing PEX Pipe Leaks

Now that you have identified the leak and gathered your tools and parts, follow these steps to fix the leak in your RV's PEX pipes. For a great visual explanation check out this video by Following the Fitchs.

Step 1: Turn Off the Water Supply

Before you begin any repairs, turn off the water supply to your RV. This will prevent any further water damage and make the repair process easier.

Step 2: Drain the System

Open all faucets and fixtures in your RV to drain any remaining water from the pipes. This will help you work with dry pipes and reduce the risk of further leaks.

Step 3: Locate the Leak

Using the methods mentioned earlier, locate the exact source of the leak. If the leak is at a fitting, you may need to replace the fitting. If the pipe itself is damaged, you will need to cut out the damaged section.

Step 4: Cut Out the Damaged Section

Using the PEX cutter, carefully cut out the damaged section of the pipe. Make sure to cut straight to ensure a proper fit for the new pipe or fitting.

Step 5: Prepare the New Pipe or Fitting

If you are replacing a section of pipe, measure and cut a new piece of PEX pipe to the appropriate length. If you are replacing a fitting, ensure that the new fitting is compatible with your existing PEX system.

Step 6: Install the New Pipe or Fitting

1. For Pipe Replacement:

   • Slide a crimp ring onto the end of the existing pipe.
   • Insert the new PEX pipe into the existing pipe.
   • Position the crimp ring about 1/8 inch from the end of the pipe.
   • Use the crimping tool to secure the crimp ring in place.

2. For Fitting Replacement:

   • Slide a crimp ring onto the end of the existing pipe.
   • Insert the fitting into the pipe.
   • Position the crimp ring about 1/8 inch from the end of the pipe.
   • Use the crimping tool to secure the crimp ring in place.

Step 7: Seal Threaded Connections

If you are working with threaded connections, wrap Teflon tape around the threads before tightening the connection with an adjustable wrench. This will help create a watertight seal.

Step 8: Turn the Water Supply Back On

Once you have completed the repairs, turn the water supply back on and check for any leaks. Open all faucets to allow air to escape from the system.

Step 9: Test for Leaks

After turning the water supply back on, carefully inspect all repaired areas for any signs of leaks. If you notice any leaks, you may need to tighten fittings or reapply crimp rings.

Additional Example of Replacing Leaking PEX pipes in your RV.

This video shows how to replace bypass valves on an RV's freshwater plumbing system. The creator demonstrates how to use SharkBite fittings and PEX tubing to complete the repair, emphasizing that it's a simpler project than it may seem. They also provide tips on sourcing the necessary materials and tools.

Additional Resources

For visual learners, the following YouTube videos provide excellent step-by-step instructions for fixing leaks in PEX pipes:

1. How to Repair PEX Pipe Leaks
2. PEX Pipe Repair Techniques

Conclusion

Fixing water leaks in PEX pipes in your RV may seem daunting, but with the right tools, parts, and instructions, it can be a manageable DIY project. By following the steps outlined in this guide, you can save time and money while ensuring your RV remains a comfortable and enjoyable space for your adventures. Remember to always prioritize safety and consult a professional if you are unsure about any aspect of the repair process. Happy travels!

Looking for other helpful guides on RV repairs, maintenance and products, take a look here;

https://www.happycampers.store/guides/