Troubleshooting RV Water Pump Check Valve Issues: Function and Replacement Guide

Table of Contents

1. Introduction
2. Understanding the Water Pump Check Valve
3. Common Issues with Check Valves
   • Freezing Damage
   • Hard Water Buildup
   • Mechanical Failure
4. Taking Apart the Water Pump
5. Identifying the Check Valve
6. Replacing the Check Valve
7. The Role of the Pressure Switch
8. Adjusting the Pressure Switch
9. Other Possible Culprits for Fresh Water Tank Overfilling
10. Alternative Solution: Installing an Inline Check Valve
11. Conclusion

Introduction

In this article, we will dive into the world of water pumps and explore the check valve inside them. Many RV owners face the frustrating issue of their fresh water tank suddenly filling and overfilling when connected to city water. The culprit behind this problem is often a faulty check valve inside the water pump. We will discuss the function of the check valve, common causes of damage, and how to address this issue effectively.

Understanding the Water Pump Check Valve

The check valve is a vital component of a water pump, responsible for preventing water from backfeeding through the pump. Its primary function is to allow the pump to draw water from a source and distribute it throughout the RV's water system. When connected to city water, the check valve ensures that the pressure from the outside source doesn't flow backward.

Common Issues with Check Valves

Freezing Damage

One of the main reasons for check valve damage is exposure to freezing temperatures. If the water inside the pump freezes, it can cause cracks or breaks in the check valve, rendering it ineffective. Proper winterization is crucial to prevent this type of damage.

Hard Water Buildup

The accumulation of hard water deposits can also cause problems with the check valve. Over time, minerals in the water can build up on the valve, impeding its operation. This buildup can prevent the valve from closing properly or cause it to stick open.

Mechanical Failure

Mechanical failures can occur in the check valve due to wear and tear or long periods of inactivity. The valve is made up of a plastic disc and a spring, which can fail over time. If the valve fails, it may need to be replaced entirely.

Taking Apart the Water Pump

To access the check valve and inspect it for damage, the water pump needs to be disassembled. By removing the screws, you can separate the pump and examine its internal components. This step allows you to locate the check valve and determine whether it needs replacement or repair.

Identifying the Check Valve

Once inside the water pump, you will find the check valve situated in a specific chamber. It is a small plastic disc that opens when water enters the pump, allowing it to flow through. When the pump is turned off, the check valve closes to prevent water from flowing backward.

Replacing the Check Valve

If you encounter problems with the check valve, there is no need to replace the entire water pump. The check valve can be replaced independently, saving you both time and money. By carefully removing the unit containing the check valve and replacing it with a new one, you can restore proper functionality to your water pump.

The Role of the Pressure Switch

The pressure switch is another component of the water pump that influences its operation. It is responsible for activating the pump when the pressure in the system drops below a certain level. Understanding the pressure switch's role can help troubleshoot issues related to the water pump's cycling.

Adjusting the Pressure Switch

While most pressure switches come preset from the factory, they can be adjusted if necessary. The adjustment determines the amount of cycling the pump does based on the pressure in the system. However, caution should be exercised when making adjustments, as improper settings can lead to pump malfunction.

Other Possible Culprits for Fresh Water Tank Overfilling

Although the check valve is a common cause of fresh water tank overfilling, there could be other culprits in an RV's water system. Winterizing valves and other components may be malfunctioning, leading to the undesired filling of the fresh water tank. It is essential to consider all possibilities to accurately diagnose and address the issue.

Alternative Solution: Installing an Inline Check Valve

If disassembling the water pump seems too complex or time-consuming, an alternative solution is to install an inline check valve. This involves screwing the inline check valve into one of the water lines, effectively blocking any backflow. While this solution may require additional materials, it can be a simpler and quicker fix for the problem.

Conclusion

The check valve inside a water pump plays a crucial role in preventing backflow and maintaining the proper operation of an RV's water system. Understanding how to identify and address issues with the check valve can save RV owners time and money. Whether it involves replacing the check valve or considering alternative solutions, maintaining a well-functioning water pump is essential for a hassle-free RVing experience.

Highlights

• The check valve inside the RV water pump can cause the fresh water tank to overfill when connected to city water.
• Common issues with check valves include freezing damage, hard water buildup, and mechanical failure.
• Disassembling the water pump allows access to the check valve for inspection and replacement.
• The pressure switch also affects the water pump's operation and may require adjustment.
• Other components in the RV's water system, such as winterizing valves, should be considered as potential culprits.
• An alternative solution to addressing check valve issues is installing an inline check valve.

FAQ

Q: Can a frozen check valve be repaired?
A: In most cases, a frozen check valve cannot be repaired and will need to be replaced.

Q: How often should the check valve be inspected?
A: It is recommended to inspect the check valve annually or whenever experiencing issues with the water pump.

Q: Is it necessary to disassemble the entire water pump to access the check valve?
A: No, the check valve can typically be accessed by removing specific components within the pump.

Q: What materials are needed to install an inline check valve?
A: To install an inline check valve, you will need the check valve itself and appropriate plumbing fittings.

Q: Can adjusting the pressure switch solve the issue of overfilling fresh water tanks?
A: Adjusting the pressure switch can help regulate the pump's cycling but may not directly solve the problem of overfilling the fresh water tank.