Mobile RV Plumbing Repair Across Florida

Why does the water pump keep cycling with no tap open?

Because the system is losing pressure somewhere, and the pump is doing exactly what it was built to do about it.

A demand pump runs until it reaches its cut-off pressure and stops. If it starts again by itself, pressure has fallen, and with every fixture closed there are only three ways that happens: a leak, a failed check valve inside the pump, or a toilet valve passing water into the black tank.

The toilet is worth eliminating first because it is silent and it leaves no evidence anywhere you would look. Water passing into the tank is simply gone.

After that the search is a matter of isolating sections and watching whether the cycling stops, which is why this symptom is so useful. It turns an invisible problem into a bounded one. It is also the one symptom worth acting on immediately rather than living with.

How do you find a leak behind a wall?

By pressure and by meter, because opening panels at random is slow, destructive and usually wrong.

The system is pressurized and then isolated section by section. A section that holds is eliminated; a section that bleeds down contains the fault. That narrows a whole coach to a short run of pipe without removing anything, and it is the difference between a targeted repair and an exploratory one.

A moisture meter then finds where the water has collected. Readings taken across the floor and the lower walls map the wet area, and the leak sits at the upper edge of it because water runs down.

Only then does anything get opened, and it gets opened in one place rather than four. Our water damage service covers what happens when the leak has been running a while.

What goes wrong with RV water heaters?

The element, the gas valve, the thermostat and the anode, and only rarely the tank itself.

A heater that works on gas but not electric, or the reverse, has told you which half to look at, because everything else is shared. On the electric side that is usually the element or its thermal cutout; on the gas side it is the igniter, the valve or a blocked burner tube, and insect nests in that tube are a seasonal certainty here.

The anode rod matters more than owners expect. In a steel tank it is a sacrificial part that corrodes so the tank does not, and one that has been left for years is no longer protecting anything.

Aluminum tanks do not take one, and fitting an anode to the wrong tank causes the damage it was meant to prevent.

Why does the water smell like rotten eggs?

Because bacteria in the tank or the heater are producing sulfide, and the heater is usually where it starts.

Warm water standing for weeks is close to ideal for the organisms that generate that smell, and a water heater left full through a Florida summer provides exactly those conditions. The smell is strongest at the hot tap, which is the clue that separates it from a fresh tank problem.

Flushing the heater, replacing a spent anode and sanitizing the whole system usually clears it. Doing only one of the three tends to bring it back within a few weeks.

If the smell is at the cold tap as well, the fresh tank and the lines are involved, and the fix is a proper sanitizing cycle with enough contact time rather than a stronger solution for less time.

What is different about RV plumbing compared with a house?

It moves, it runs at lower pressure, and its fittings only look like household ones.

Everything in a coach vibrates down the road, so joints work loose in a way house plumbing never does, and lines are routed to allow for that movement. A repair made rigid where the original was not simply moves the failure a few inches along.

Pressure is the second difference. Coaches are built for a much lower supply pressure than a house, which is why a regulator at the campground pedestal is not optional and why an unregulated hookup can split a line.

Third, the parts. Some household fittings thread onto RV components and then fail under vibration or crack in a cold snap, and drain fittings in particular are not interchangeable. Using the right parts is not fussiness here; it is the difference between a repair that lasts and one that fails on the next trip.

Why will the black tank not empty?

Either the tank is blocked or the valve is seized, and the two are told apart before anything is forced.

A blockage is nearly always the result of dumping at too low a level. Solids need a volume of liquid leaving quickly to carry them out, and a tank emptied at a quarter full leaves them behind to build up. Water and time dissolve that; nothing rigid should ever go down the toilet.

A seized valve is the different fault. The blade is gripped by dried seals rather than blocked, and pulling harder on the handle bends the rod or shears the blade off inside the housing.

That distinction matters because one of them clears itself overnight with the tank full, and the other becomes a replacement done from underneath. Dumping at two thirds full or more, and keeping the black valve closed on a hookup, prevents nearly all of it.

What does Florida do to RV plumbing?

It removes the freeze risk and replaces it with a worse one, which is warm water standing still.

A coach stored through the summer here has a full fresh tank and a full run of lines sitting at ambient temperatures in the eighties and nineties for months. That is what produces the taste and smell problems owners report on the first trip of the season, and it is why sanitizing matters more in this state than winterizing does.

Freeze is not zero, though. The northern half of the state does drop below freezing, and a coach left with water in its lines during a cold snap splits a fitting exactly as it would anywhere else.

The other local factor is water quality, which varies enough between counties that a filter is worth fitting and changing on schedule.

When does a plumbing leak stop being a DIY job?

When you cannot see the pipe, when the floor feels soft, or when the leak involves the water heater's gas side.

A visible fitting under a sink is a reasonable owner repair with the right parts. A line behind a wall is not, because finding it is the skilled part and opening the wrong panel costs more than the repair.

A soft floor changes the job entirely. At that point the water has been there long enough to reach the structure, and sealing the pipe no longer addresses what is actually wrong.

Anything involving the gas side of a water heater belongs to someone who will pressure test it afterwards. Our LP gas service covers that side and our damage guide covers the signs that come before a stain. Neither of those is a judgement about competence - it is about what the fault has already reached.

Plumbing questions RV owners ask us

Sources

• Shurflo - RV water pumps - Manufacturer documentation for demand pumps, check valves and pressure switches.
• Suburban - RV water heater manual - Manufacturer instructions covering the anode, the bypass valves and gas-side servicing.
• Valterra - waste valves and fittings - Documentation for gate valves, blades and seals on the waste side.
• EPA - moisture and mold - Why a slow leak into a floor is a structural and air-quality problem rather than a cosmetic one.