RV Toilet Won’t Fill With Water – What To Do?

Having a functional RV toilet is vital when taking a vacation. However, RV toilets need to be filled with water for them to work correctly. So what do you do if your RV toilet won't fill with water? We have done the research for you to help solve this issue.

If your RV toilet won't fill with water, it is typically because of an issue with the water valve. It could be as simple as the water valve being stuck. However, the water valve could need to be replaced. Try closing the valve, removing the hose, reattaching the hose, and turning on the water valve slowly. This should fix the problem! If this doesn't work, then check for any blockages that could be causing the issue.

Before you hit the road for a vacation, you will want to ensure that your toilet is working properly. Without water in the toilet bowl, the toilet won't flush properly. In this article, we will look at fixing an RV toilet that won't fill with water, so keep reading!

A camper van interior cabin RV bathroom, RV Toilet Won't Fill With Water - What To Do?

RV Toilet Won't Fill With Water

A toilet that won't fill with water isn't suitable for more than just the obvious. When an RV toilet does not hold water, it means that there is something wrong with the system itself. 

A broken or faulty RV toilet is something to be concerned about because the entire waste system has to be flushed out if it gets backed up. This can take a long time and is not something that you want to deal with on vacation.

The first thing you need to do when attempting to fix an RV toilet that won't fill is to locate the water valve for the holding tank and close it off.

When you do this, the tank will not be able to fill or drain again until the valve is opened, which will send water into it rapidly for a second when it fills.

There are times that, when you close this valve off, it may just pop back open by itself, especially if there is no damage done to the system and everything is set up correctly.

If it doesn't work the first time, you will need to check for any blockages in the system. Also, debris can cause problems with a toilet holding tank, so it is essential to look at everything before trying anything else.

The water inlet screen is a common spot where debris accumulates and prevents water from entering the tank. If you are having trouble removing anything, then it would be a good idea to take some tools with you when you leave on your trip so that you can remove them if necessary.

Last but not least, remember that water pumps have an automatic shut-off system if they are struggling too much or are overworked. This protects the pump from burning out, which can cost you money if it isn't under warranty.

If this happens, then you will need to replace the water pump.


How long should an RV toilet seal last?

RV toilet seals last an average of about 20 years but could last as long as 30 years. If you aren't sure what an RV toilet seal is, it's the thing that attaches to the bottom of your toilet and keeps all of the mess in.

There are ways you can tell if your toilet seal needs to be replaced. If you have any leaking at the toilet base, then that is a good sign that the seal needs replacing. Another way to know is if you have foul odors coming from the toilet. The seal may need to be cleaned or replaced.

Toilet in bathroom cabin of RV camper

What is an RV Toilet Seal?

An RV toilet seal is the piece that attaches the bottom of your toilet seat to the waste system. The waste will travel through pipes and hit a rubber seal at the bottom of the bowl before being directed away.

The waste in an RV can be very messy, so having a good quality seal is essential for keeping everything inside where it is supposed to be.

If you don't have a quality seal, then odors and mold will begin to grow in the loose pieces of plastic, causing problems with your RV toilet.

Can the seal in an RV toilet be replaced?

You should be able to replace the seal in an RV toilet, but it's going to depend on how comfortable you feel taking things apart. It would likely require at least partially disassembling the toilet and removing any parts attached to the bottom of your seat.

If you aren't sure, then buying a whole new RV toilet may be easier than going through the hassle of replacing it. If you have a good idea about what you are doing, then find the closest match to your model and make it. Otherwise, our guide below will help you out!

RV vehicle detail of the toilet

What are some common problems with RV toilet seals?

The most common problems with RV toilet seals are that they become loose or get clogged up. When it comes to a loose seal, this may be because you were trying to replace it without buying a new one and couldn't find a way of getting it back on.

This can easily happen, but you can also be doing everything right, and it still comes off. When this happens, then you will need to replace it.

When an RV toilet seal gets clogged up, this typically means that something is stuck under the bottom of your seat, and the water isn't going through properly.

If your RV toilet doesn't fill because whatever is in there isn't getting moved, you will want to remove whatever is stuck there so that it can fill up correctly.

How do you seal an RV toilet?

There are times when an RV toilet will begin to leak either around or on top of the seal. This can be caused by something as simple as debris buildup or even rusting.

To fix an RV toilet seal, you will have to remove it from the bottom of your toilet. You can do this by simply lifting it and off the seat until you can reach underneath. Sometimes, there may be screws holding it in place.

After the seal is removed, you will want to clean up any debris that may have settled onto or into it. You can use a paper towel and some rubbing alcohol to do this.

When putting on the new seal, be sure to use a plumbers glue and attach the new seal. Once dried, you can now put the toilet back together.

If the toilet seal continues to leak after everything has been cleaned and removed, then you may want to consider replacing it altogether. Remember that this is not an issue if the seal only appears to be old and dirty or rusty.

Inside of RV with washroom toilet sink shower cabinet

How much water does it take to flush an RV toilet?

Typically, you only need 3-4 inches of water to flush an RV toilet. If your toilet is vented correctly, you can go by the rule of thumb; you should have between ¼ and ½ inch water left in your tank after flushing.

If this isn't the case, then it's likely that your RV toilet seal has come off. In addition, it could be clogged with something you need to remove. If this still doesn't match the amount of water you have, it may be time to call a professional.

In closing

Having water in your RV toilet is critical. Without the water in the bowl, then the toilet won't flush the waste. If your RV toilet doesn't fill with water, then check your water valve for any blockages.

In addition, the water valve itself could be faulty and could need replacing. If you feel stuck and can't diagnose the problem, then take it to a professional.

If you like this article, then you should also check out:

What Size Generator Do You Need For A Toy Hauler RV?

Rv Toilet Keeps Clogging: What To Do? [7 Actionable Methods]

9 Best RV Toilet Cleaners For Any Rig [Motorhomes, Travel Trailers Etc.]

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