RV Toilet Won’t Fill With Water – Causes and Solutions

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Having a functional toilet while vacationing or camping in your RV is very important. However, for an RV toilet to work properly, it needs to be filled with water correctly. What should you do if your RV toilet won’t fill with water?

Read below to find out how to fix a toilet that won’t fill with water.

RV Toilet Won’t Fill With Water – Causes

A toilet that won’t fill with water isn’t suitable for more than the obvious. A malfunctioning plumbing system is the cause of an RV toilet that won’t hold water. 

Most likely, there is a problem with the water supply valve if your RV toilet isn’t filling with water. It will prevent water from entering your toilet if the valve is broken, stuck, or accidentally turned off. The problem can also be caused by your water pump. 

Here are possible reasons why your RV toilet won’t fill with water.

Reason 1: Water supply valve issues 

The most frequent cause of a toilet not filling with water is this. When you flush the toilet in your RV, water from the fresh water tank is sent into the bowl by the water supply valve. It is typically near the floor, behind or to the side of the toilet.

This valve’s additional purpose is to enable you to turn off the water supply to the toilet in the event of a leak. In case you or someone else needs to clean the toilet, it is also necessary.

It’s possible that you turned it off unintentionally and without recognizing it. It’s simple to turn the valve back on because it’s accessible. If this isn’t the case, though, you might need to start looking into the problem. The water supply valve can be broken or stuck.

Reason 2: Water Pump

Your water supply valve is not the sole factor preventing water from entering your RV toilet.  Another factor that could prevent your RV from filling up is the water pump.

When left on for too long in older rigs, the water pump can start to burn out. Your RV will draw from your fresh water tank as necessary if it is not connected to water facilities. Your rig uses the water pump to transfer water from the tank to your faucets, toilet, shower, and other appliances. Your pump will function as it is intended to when it is turned on and in use.

Your pump can, however, burn out if it is kept on while no water-dependent appliances are in use. As a result, it won’t function in the future, and water won’t get into your toilet. Newer equipment typically has a safety mechanism against this. The water pumps will automatically shut off to prevent burnout if they are left on and get overworked as a result.

Reason 3: General water shutoff

A general water shut-off at the campground where you are camping is an unusual cause of water not entering your toilet bowl. The majority of facilities or campgrounds will notify campers in advance if their water supply will be cut off to all campsites. 

Although, most of the time there isn’t a warning. This can be annoying since it forces you to continue troubleshooting even while your equipment is fine. Checking to see if the issue is limited to your toilet or if all of your appliances aren’t getting water is an easy way to confirm this. Then you can move on to other campsites to determine whether or not their water hookups function as well.

How To Fix An RV Toilet That Won’t Fill With Water

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If your RV toilet won’t fill with water, there are a few things you can do to try and fix the problem. 

  • First, make sure that all of the toilet’s plumbing connections are tight. Faulty plumbing will prevent water from entering your toilet.
  • Also, check your water supply valve to see if it is in perfect condition. It could be stuck, damaged, or accidentally turned off. If it is accidentally turned off, you can just switch it back on and get the water supply back, but if it is stuck or damaged, you might need to call a plumber to have it fixed or replaced totally. 
  • Next, check for clogs in any of the drains or pipes leading away from the toilet bowl. To check for a clog, you’ll need to remove the tank and look for debris (small stones, leaves, etc.) blocking the water flow. You can also try to twist the pipe leading from the sewers to the tank for a loose connection. 

How Long Should an RV Toilet Seal Last?

The RV toilet seal is the connection between the toilet and the cistern tank. The waste will move through pipes and then be directed elsewhere after it contacts a rubber seal at the bottom of the bowl. 

RV toilet seals last about an average of 20 years but could last as long as 25 years. There are signs that your toilet will exhibit to let you know that it needs replacement. If you notice that there is liquid leakage at the base of your toilet, then it needs replacing. If you also notice that your toilet is producing a foul odour, then most of the time, your toilet needs replacement.

Can An RV Toilet Be Replaced?

Yes, an RV toilet is just like a regular toilet, and it can be replaced. There are a few signs that your RV toilet may need to be replaced. One of the most common issues is that the bowl can become clogged over time, leading to poor performance and long wait times for wastewater disposal. 

Another issue that often arises is when the mounting bolts loosen or break, causing water damage or even structural failure. Replacing an RV toilet should only be done if it’s determined that doing so will fix the underlying problem and won’t cause any further damage or inconvenience.

To replace an RV toilet, you will first need to unscrew the toilet bowl. After that, you will need to remove the flapper and the tank. Afterwards, you will need to replace the toilet bowl and the tank. Make sure to replace the flapper and the tank in the same manner that they were removed.

When replacing an RV toilet, make sure to keep the following things in mind:

  • Make sure that the replacement toilet is the correct size.
  • Make sure that the replacement toilet has the right type of fill valve.
  • Make sure that the replacement toilet has been properly flanged.
  • Make sure that the replacement toilet has been properly wired.

Be sure to call a professional to come and replace it. Doing it yourself can be a dangerous task and may not result in a proper job.

How Much Water Does It Take to Flush an RV Toilet?

RV toilets basically use about a quarter gallon to a gallon per use. However, this usage of water depends on the person using it.

Basically, water will continue to flow as long as you hold down the flushing mechanism handle.

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Following this guide, you will be able to determine why your RV toilet isn’t filling with water and ways to fix it.

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Written by Jane Miller

I'm Nomadic Jane, a digital nomad and travel blogger. Since 2009, I've been traveling the world and exploring cultures through my travel blog.