How To Repair A Burst Water Line In An RV

What a mess when you turn on the water pump and immediately see water running out onto the floor! (This is most likely to happen when you’re getting ready for your first RV outing after a long cold winter.)

If you see the water running out, then you’re ahead of the game — because you know where to look.  If the water pump keeps on running, or pulses on and off continually, then you still have a leak.  It may just take a bit more effort to find the problem area.

rv-plumbing-lines.jpg With a thorough search inside cabinets, outside storage spaces, or even under your RV, you can usually find the problem area.  Removable panels will allow access to the plumbing behind the shower faucet and the area around the water heater.  Sometimes, as in our Dutchman 18B travel trailer, there are water lines running along the inside — under the bed storage area.

Once you have located the spot where water sprays out, it’s time to determine what type of fittings or hose will be needed to make the repair.

Types Of Water Lines

If the split is in a water line, you probably have either of 2 types of water line:

  • Copper lines are seldom used in today’s RVs.  They can be found in older units dating back to the 60’s or 70’s. 
  • Today, plastic is the material of choice for RV water lines. 

 

How To Repair The Water Line

When water lines freeze and split, you will be left with a cut in the line — possibly as long as an inch or so.  Usually there is enough slack or movement in the line to allow you to cut out the damaged section containing the split.  Then, you can rejoin the two ends with one fitting.

If the damage requires you to take out a longer section of water line, then you will need 2 fittings and a similar length of replacement water line to make the repair.

Cutting copper lines will require a tubing cutter so you don’t deform the tube. A utility knife will allow you to cut plastic water lines.  In either case, cut out only a section large enough to remove the damage.

 

Types Of Fittings
A compression union fitting is the best choice when reattaching the 2 good ends of the water line.  You could also take your small damaged section of water line with you to the hardware store (or RV dealer if it’s closer), and they can fix you up with the proper fitting.  Installation will require a couple wrenches.  Or, in the case of plastic fittings, probably a pair of pliers will take it beyond hand tight securing a good connection.

rv-plumbing-pipes.jpg Often, water can get trapped in an elbow fitting when a low spot is created.  The split or crack can be hard to see, but as soon as you turn on the water pump, water will spray everywhere.

Elbow fittings can be both compression style and pipe thread (where they screw into another fitting or appliance).  Again, the best way to assure that you get the correct fitting is to remove the damaged item and take it with you to the store to find a suitable replacement.

When replacing pipe thread fittings, be sure to wrap the threaded portion with a couple layers of Teflon tape before screwing them in place.  This will help to prevent the fitting from leaking under pressure.  Compression fittings don’t require any additional sealant; the act of compressing the parts together is all that is required to give a good watertight connection.

Sometimes finding the exact replacement fitting may be a little hard.  Depending on your mechanical ability, a little “outside the box” thinking may be required to re-plumb the problem area in a different manner using different fittings.  When it comes to RV plumbing, there are usually 2 or 3 ways to get the job done.  Rely on the help of store personnel to help you come up with a workable solution.

Even the best efforts to properly winterize an RV can leave water in unexpected places.  A water line leak isn’t the end of the world, but it is a problem that must be addressed immediately, before water leaks into the structure doing thousands of dollars worth of damage.

Curtis Carper

I’ve been involved in RVing for over 40 yrs -- including camping, building, repairing, and even selling RVs. I’ve owned, used, and repaired almost every class and style of RV ever made. I do all of my own repair work. My other interests include cooking at home, living with an aging dog, and dealing with diabetic issues. If you can combine a grease monkey with a computer geek, throw in a touch of information nut and organization freak, combined with a little bit of storyteller, you've got a good idea of who I am.

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  • wilma

    how do you reach a water pipe that had a leak under the drawers. that it is impossible to reach? who can you get to fix a problem like that??

    • Curtis

      wilma, Sometimes it’s more practical to run a new water line when you can’t get at the portion that is damaged.  Because the factory ran the line where you can’t get at it doesn’t mean the new line must follow the exact same path.  Any RV dealer can take care of the problem or a reasonably good handyman.

  • Bill

    IS 3/8″ a standard sise of plastic pipe used in rv water lines

    • curtis

      Bill, Like in house plumbing there are a variety of sizes and types of water lines used.

  • Barbara

    My water leak seems to be at a solenoid where several lines are routed through. I cannot understand why a solenoid would be there and what to do to fix it.

    • Curtis

      Barbara, Me neither, without seeing what your referring to there’s not much I can do to help

  • Amber

    Are you available in southern ca to fix a plastic water line that broke from over tightening?
    Amber

  • Hailey Gossett

    We have 1998 Dutchman and there is a major leak between the floor and the bottom of the camper it runs out the seams on the outside…. we are unsure how to locate it from inside or outside. and need to fix it asap

    • Curtis

      Hailey, you have two choices. Start disassembling until you find the problem, or if that is to much locate both ends of the line and replace the line completely with a new line running it through a different route. If this sounds to daunting, time to take it to the dealer and let them handle it. Too little knowledge can get you in over your head quickly.