Mobile service

Mobile RV plumbing and tank repair

An RV water system has a lot going on in a small space: a fresh tank and pump, a city water inlet, a water heater, gray and black holding tanks, dump valves, and lines running through cabinets and under floors. Leaks here can soak floors and cabinets quietly, and a dump valve or sensor problem can bring a trip to a stop. A mobile RV tech can come to your campsite, driveway or storage spot and handle most plumbing repairs in place. Describe what is leaking or not working, and include photos of the area and of any labels on the pump or valves.

Request RV plumbing and tank repair Check recalls first
Updated September 25, 2026Written by the Trackara team
Quick answer

Yes. A mobile RV tech can repair leaks, replace water pumps, faucets, valves and fittings, fix dump valves, clear many tank clogs and sensor problems, and winterize or de-winterize the water system where the RV is parked. Replacing a tank that must be dropped from under the RV may need a shop or a well-equipped tech.

Signs you need RV plumbing and tank repair

  • Water pump runs constantly or cycles on and off with no faucet open
  • No water pressure from the pump or the city water connection
  • Water under sinks, around the toilet or on the floor
  • Tank gauges always read full or always read empty
  • Dump valve stuck, hard to pull or leaking
  • Slow draining sinks or shower
  • Sewer smell inside the RV
  • Toilet will not hold water in the bowl
  • Cracked fittings or lines after cold weather

Black tank waste carries germs, so leave tank and dump valve repairs to the tech and wash well after any contact. Turn off the water heater and let it cool before any water system work, and turn off the pump and city water before a tech opens lines.

Common causes

Leaking fittings and linesFittings loosen with road vibration, and lines can crack if water freezes inside them. A small leak can make the pump cycle on and off.
Worn water pump or check valvePump switches and check valves wear out, causing constant running, pulsing flow or no pressure.
Freeze damageWater left in lines, the pump, faucets or the water heater can expand and crack parts when temperatures drop. Proper winterizing prevents it.
Tank sensor buildupWaste and residue stick to the sensor probes inside the tanks, so gauges give false readings even when the tank is empty.
Dump valve wearGate valve seals wear and cables stretch, causing leaks, sticking or valves that will not fully open or close.
Clogs and vent problemsBuildup in the black tank, a blocked drain or a blocked roof vent can cause slow drains and sewer odors.
Toilet seal failureThe seal at the bottom of an RV toilet dries out or wears, letting water drain from the bowl and odors come up.

What gets done where it's parked, and what needs a shop

Usually done on site

  • Finding and repairing leaks in lines and fittings
  • Replacing water pumps, pump switches and check valves
  • Replacing faucets, shower valves and toilet seals
  • Repairing or replacing gray and black tank dump valves
  • Tank sensor cleaning, replacement or upgrade
  • Clearing many drain and tank clogs
  • Water pressure regulator and city water inlet repair
  • Winterizing and de-winterizing the water system

May need a shop or lift

  • Dropping and replacing a holding tank when there is not enough clearance or support on site
  • Leaks that have caused floor or subfloor rot needing structural repair
  • Lines buried behind walls or under floors that require removing interior panels on a larger scale

Every mechanic's setup is different. The one who accepts your request will tell you if your job needs a shop.

Before the mechanic arrives

  • Dump and flush the holding tanks before the visit if you safely can
  • Clear out cabinets under sinks and around the pump so the tech can reach them
  • Note whether the problem happens on the pump, city water or both
  • Take photos of leaks, water damage and the pump or valve labels
  • Tell the tech if the RV was winterized, and when

Photos of warning lights, leaks or damage help the mechanic bring the right parts. You can add up to five with your request.

Questions to ask when you get a quote

  1. Is this leak in a fitting, a line or an appliance like the water heater?
  2. Do you carry common RV plumbing parts, or will some need to be ordered?
  3. Can you check for water damage around the leak?
  4. Is my pump bad, or is the problem a check valve or leak elsewhere?
  5. Can you winterize or de-winterize the RV while you are here?
  6. Would a sensor upgrade or tank flush help my gauges read correctly?

Trackara never handles payment for the work. You agree the price with the mechanic before they start, and you pay them directly. How to read a repair quote.

Vehicles this applies to

RVs and motorhomes Trailers

RV plumbing and tank repair: questions and answers

Yes. A pump that keeps cycling usually means a leak somewhere in the system, a worn check valve or a bad pump switch. The tech will look for leaks first and then test the pump, and most of this is done on site.
Buildup on the sensor probes inside the tank is the usual cause, even after dumping. Flushing the tank can help, and some owners switch to a different type of sensor. A tech can tell you which fits your RV.
Usually, yes. Valves and cables can be repaired or replaced where you are parked. Ask your campground about rules for sewer connections and repairs first.
If the RV will be exposed to freezing temperatures, water left in the lines, pump, faucets and water heater can freeze and crack parts. A tech can winterize it for you, and de-winterize it and check for leaks in spring. The RV pre-trip checklist covers what to check before you head out.
Send a free request with photos and a short description. A mechanic who covers your area and works on RVs can quote before starting.
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