Water Pump Replacement - A1 RV Repair

Can I just rebuild my old pump instead of replacing it?

Rebuilding an RV water pump isn't a practical option - the internal check valves, diaphragms, and seals aren't sold as serviceable parts, and the pump housing isn't designed to be opened and reseated cleanly in the field. Even if you source aftermarket seals, you're reassembling a pump that already failed once, with worn pressure switch contacts and a motor that's logged unknown hours.

A used pump carries the same problem: no way to know where it is in its service life. For $400-$650 installed, a new pump comes with a manufacturer warranty and gives you a known starting point. That matters when the alternative is a diaphragm letting go inside your walls and running water into cabinetry or subfloor - a repair that routinely runs well past $2,000.

How long does a replacement pump last if I maintain it?

A properly maintained pump typically runs 8-12 years, and we've seen Shurflo units hit 15 years on rigs that go out a few months a year. The two biggest factors under your control are keeping the inlet strainer clean and never running the pump dry - even a few minutes of dry cycling damages the diaphragm and check valves in ways that aren't always obvious until the pump starts short-cycling or losing prime months later.

Full-time use compresses that range to 6-8 years, and hard water or heavy sediment shortens it further by grinding the diaphragm and fouling the check valves faster. Winterizing correctly matters too - water left in the pump that freezes can crack the housing outright. If you're on a well or a questionable water source regularly, adding a pre-filter ahead of the pump is the single best thing you can do to extend service life.

Does the pump replacement work the same on a Class-A motorhome as a travel trailer?

The pump itself is the same technology across both - a 12V demand pump that runs when you open a faucet and shuts off when pressure holds. What changes is access.

On a travel trailer, the pump is usually in a pass-through bay or under a dinette with a few minutes of work to reach it. On a Class A, it can be tucked behind a panel near the wet bay, under a slide, or in a compartment shared with other plumbing runs, which adds time to the job.

We confirm the make, model year, and pump location by phone before we arrive so we bring the right replacement and the right tools. Dometic and Shurflo cover the majority of installs, but if your rig takes a less common unit, we source it before scheduling rather than discovering that on your driveway.

What if the problem is actually my water heater, not the pump?

The pressure test we run at the start of every plumbing call separates these two quickly. Cold water pressure is produced entirely by the pump, so if cold lines are weak or pulsing, the pump is where we start.

If cold pressure is normal but you have no hot water - or hot pressure is significantly lower than cold - the water heater is the likely culprit. That could mean a failed heating element, a tripped ECO switch, a bad thermostat, or a clogged inlet screen on an Atwood or Dometic unit. We carry parts for common water heater failures on the truck, so if the diagnosis points that direction, we can often quote and complete the water heater repair the same visit rather than scheduling a second call.

Can I drive my RV without water if the pump fails on a long trip?

Technically yes - a failed water pump doesn't affect your engine, drivetrain, or generator, so the rig is safe to drive. What you lose is every 12V water function: faucets, toilet flush, shower, and anything downstream of the pump.

That's manageable for a few hours but gets expensive fast once you're paying for motel rooms or buying bottled water for cooking and brushing teeth. A pump swap is one of the more straightforward jobs we do - we carry common Shurflo and SHURflo-style replacement units on the truck, and most installs run 2-4 hours including line checks and a pressure cycle to confirm no fittings were stressed by the dry-run.

If you're outside our our covered metros service areas, our partner network can usually get someone to your location without a long wait. Limping along rarely saves money once you add up the nights off-road.

Do you warranty the pump if I install it myself and it fails?

The manufacturer's warranty on the pump unit itself follows the part, not the installer, so if the pump is defective out of the box you can pursue that claim regardless of who put it in. Our 90-day workmanship warranty is a different thing entirely - it covers the quality of our installation: fittings, connections, mounting, wiring, and how the system performs as a whole after we button it up.

If you install the pump yourself and something goes wrong, we'll come out and diagnose it, but any labor to fix a DIY install is billed at our standard rate from the first minute. The most common DIY failure points we see are undertightened barb fittings that weep slowly, reversed polarity on the pump leads, and missing inline strainers that let debris kill a new pump within a few weeks. If you're unsure about any of those steps, it usually costs less to have us do the install than to pay for a second service call later.

Is the pump the same if I have a Shurflo or Dometic brand fresh tank?

The pump and the fresh tank are separate components - the tank brand has no bearing on which pump fits your rig. What actually drives pump selection is your 12V electrical setup (wire gauge, fuse rating, and whether you're running a demand switch or a pressure switch), the diameter and type of your inlet and outlet lines, and the flow rate your system was originally sized for.

Older rigs frequently run Shurflo pumps; newer motorhomes more often come with Dometic units. We carry both on the truck, along with the common fitting adapters, so we can match the replacement to your existing plumbing without forcing you to re-route lines or upsize hardware. If your pressure accumulator tank is original to the rig and showing wear, we'll flag it while we have the lines disconnected - replacing it at the same time saves a return visit.

Will a new pump fix low water pressure, or could it be something else?

A new pump alone won't fix low pressure if the real culprit is somewhere else in the system. Before we swap anything, we run a full pressure test and trace the lines from the pump outlet to each fixture - checking the inlet strainer for debris, feeling the supply lines for kinks or crush points, and testing the accumulator tank to see if it's lost its pre-charge.

A dead accumulator causes the pump to short-cycle every few seconds even when pressure reads normal, which a lot of owners mistake for a failing pump. If the strainer is blocked, a five-minute cleaning solves it without touching the pump.

If lines are kinked behind a cabinet, we reroute before installing anything new. The pressure test costs nothing - we quote the actual fix, whatever it turns out to be, before we start work.