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RV Water Pump Leaking When Connected to City Water

Owning an RV brings the joy of exploring the great outdoors, but sometimes unexpected problems arise.

One such issue is when the RV water pump starts leaking when connected to city water.

This can be a frustrating experience for RV owners, as it affects their ability to enjoy a continuous supply of water during their trips.

In this guide, we will delve into the possible causes of this problem and offer practical solutions to address it effectively.

Understanding the RV Water Pump

Before we dive into troubleshooting, it’s essential to have a basic understanding of the RV water pump and its role in the water system.

The water pump is responsible for pressurizing the water in your RV’s plumbing system, allowing you to have a steady flow of water whenever you need it.

When connected to city water, the pump is bypassed, and water flows directly into the plumbing system.

However, when your RV water pump is leaking during this connection, it’s crucial to identify the underlying cause and fix it promptly.

Common Causes of RV Water Pump Leaking When Connected to City Water

Faulty or Damaged Water Pump Seals

The most common cause of a leaking water pump is worn-out or damaged seals.

Over time, these seals can deteriorate due to continuous use or exposure to harsh conditions, leading to leaks.

Loose Connections

Another possible reason for water pump leaks is loose connections in the plumbing system.

Vibrations during travel or improper installation can cause connections to become loose, resulting in leaks.

Excessive Water Pressure

High water pressure from the city water supply can exceed the pump’s capacity, causing leaks in the plumbing system.

This problem can be more prevalent in older RVs with outdated plumbing fixtures.

Cracked Water Pump Housing

If the water pump housing develops cracks or fractures, leaks can occur.

This can happen due to accidental damage or prolonged exposure to extreme temperatures.

Damaged Check Valve

The check valve prevents backflow of water into the water pump.

If the check valve is faulty or damaged, it can cause leaks when the RV is connected to city water.

Troubleshooting Steps to Fix RV Water Pump Leaks

Now that we’ve identified the potential causes, let’s explore some troubleshooting steps you can take to fix your RV water pump leaks when connected to city water.

Step 1: Inspect the Water Pump and Seals

Start by visually inspecting the water pump and seals for any visible signs of damage, such as cracks or wear.

Use a flashlight to get a clear view of the pump and its components.

If you notice any issues with the seals or pump housing, it’s likely the source of the leak. In this case, replacing the seals or the entire water pump may be necessary.

Step 2: Check for Loose Connections

Next, check all the connections in your RV’s plumbing system. Ensure that they are tight and secure.

If you find any loose connections, use an appropriate wrench or pliers to tighten them.

A simple fix like this can often solve the leakage problem.

Step 3: Test the Water Pressure

To determine if excessive water pressure is causing the leaks, use a water pressure gauge to measure the incoming city water pressure.

If the pressure exceeds the recommended range for your RV, consider using a pressure regulator to reduce it to a safer level.

This can help prevent future leaks and protect your RV’s plumbing system.

Step 4: Inspect and Replace the Check Valve

Inspect the check valve, located near the water pump. If it appears damaged or fails to function correctly, it’s advisable to replace it.

A faulty check valve can contribute to leaks and backflow issues, affecting the overall performance of your RV’s water system.

Step 5: Seek Professional Assistance

If you’ve followed the above steps and are still experiencing water pump leaks, it may be time to seek professional assistance.

An experienced RV technician can diagnose the problem accurately and recommend the best course of action.

They have the expertise and specialized tools to address complex issues and ensure your RV’s water system functions optimally.


Why is my RV water pump leaking only when connected to city water?

The most likely cause is excessive water pressure from the city supply. High pressure can overwhelm the water pump, leading to leaks.

Can I continue using my RV water pump even if it’s leaking?

It’s not advisable to use a leaking water pump, as it can worsen the problem and cause further damage to your RV’s plumbing system.

How can I measure the water pressure from the city supply?

You can use a water pressure gauge available at most hardware stores. Simply connect it to an outdoor faucet and turn on the water to get an accurate reading.

Are there any preventive measures to avoid RV water pump leaks?

Yes, installing a pressure regulator can help regulate the water pressure, protecting your RV’s plumbing system from potential leaks. Regularly inspecting and maintaining your water pump and connections is also crucial.

What should I do if I can’t find the source of the leak?

If you’re unable to locate the source of the leak or the problem persists, it’s recommended to consult a professional RV technician for a thorough inspection and repair.

How often should I replace the water pump seals?

Water pump seals should be replaced periodically, especially if signs of wear or damage are visible. Consult your RV’s user manual or an RV professional for specific recommendations based on your water pump’s model.


Dealing with an RV water pump leaking when connected to city water can be frustrating, but understanding the potential causes and taking appropriate troubleshooting steps can help resolve the issue.

By inspecting the water pump and seals, checking for loose connections, and managing water pressure, you can mitigate leaks and ensure a smooth and enjoyable camping experience.

Remember, when in doubt, don’t hesitate to seek professional assistance to avoid further complications.

Happy travels!