Replacing an RV water pump is one of the more approachable DIY repairs on a rig — no specialized tools, no cutting into walls. The job is: disconnect power, swap hoses, reconnect power, test. Most people finish in under an hour.
Replacing an RV water pump is one of the more approachable DIY repairs on a rig — no specialized tools, no soldering, no cutting into walls. The job is: disconnect power, swap hoses, reconnect power, test. Most people finish in under an hour.
Here's the complete process, including what to buy and what to watch out for.
Before You Buy a Replacement Pump
Confirm the pump is actually failed before you order one. The most common reasons a pump "fails" that aren't actually pump failure: empty fresh water tank, clogged inlet strainer, closed shutoff valve, or a blown fuse. A functioning pump that's pulling air will behave exactly like a failed pump. Run through the water pump troubleshooting checklist first.
If the pump runs hot, makes grinding noises, has lost significant pressure compared to before, or produces no output with a confirmed full tank and clean strainer — it's time to replace it.
What to Buy
The two dominant brands are Shurflo and Flojet. For most travel trailers and Class C motorhomes, the Shurflo 2088 series (3.5 GPM, 55 PSI) is the standard replacement. Class A rigs with higher demand sometimes use the 4008 or 4048 series (4.0 GPM). Match the port size on your existing pump — most use 1/2" barbed fittings but some older rigs use 3/8".
- Shurflo 2088-554-144 — most common replacement, 3.5 GPM, fits most travel trailers and Class C
- Shurflo 4008-101-E65 — higher output (4.0 GPM) for Class A or rigs with multiple bathrooms
- Flojet 03526-144A — solid alternative to Shurflo 2088, identical port sizing
- Buy the matching inlet strainer if yours is old — they're $8 and worth it
- Have a roll of Teflon tape on hand for the fittings
Tools You Need
- Flathead and Phillips screwdrivers
- Hose clamp pliers or regular pliers (for screw-type hose clamps)
- Adjustable wrench (for threaded fittings if present)
- Multimeter (to confirm wire polarity before connecting)
- Flashlight or headlamp
- A towel and small bucket — there will be residual water
Step-by-Step Replacement
Turn off and isolate the pump
Switch the pump off at the panel or 12V fuse block. Better yet, disconnect the negative battery cable if the pump is easily accessible from battery storage. Never work on the pump while it has power.
Locate the pump
RV pumps are usually in a basement storage compartment, under a dinette seat, under the bed platform, or in a cabinet near the fresh water tank. Check your owner's manual if it's not obvious. The pump will have two water hoses and two wires (red and black or red and white).
Photo everything before touching anything
Take a photo of the wire connections and hose routing before disconnecting. This takes 10 seconds and eliminates confusion on reassembly.
Disconnect the 12V wires
Note which wire is positive and which is negative on your existing pump — pumps are polarity-sensitive and will run backwards (or not at all) if wired in reverse. Most pumps use a spade connector that pulls off by hand. If yours is hardwired, note the wire colors carefully.
Disconnect the inlet hose (suction side)
The inlet (suction) hose pulls from the fresh water tank. Loosen the hose clamp and slide the hose off the pump barb. Have a towel ready — water will drip. The inlet is usually the port closest to the tank and may be labeled on the pump.
Disconnect the outlet hose (pressure side)
The outlet runs toward your water lines. Some water will remain in the lines and drip out when you disconnect. Let it drain into your bucket.
Remove the old pump
Most pumps are screwed down with 3–4 sheet metal screws. Remove them and lift the pump out. If there are threaded barb fittings that will transfer to the new pump, use pliers or a wrench to remove them (they unscrew counterclockwise).
Install fittings on the new pump
If you're transferring threaded barb fittings, wrap them with 2–3 layers of Teflon tape and thread them into the new pump hand-tight, then a quarter turn snug with a wrench. Do not overtighten — you're threading into plastic.
Mount the new pump
Set the new pump in position (inlet facing the tank, outlet facing the water lines) and drive in the mounting screws. The pump will vibrate when running, so secure it fully.
Reconnect hoses
Slide hoses onto the barb fittings and position hose clamps at least 1/4 inch from the barb end. Tighten clamps firmly — a loose hose clamp on the inlet side will allow air in and break the pump's prime.
Reconnect wires with correct polarity
Match positive to positive and negative to negative using your earlier photo as reference. Reversed polarity won't damage the pump immediately but it will run backwards and not move water.
Test before closing everything up
Restore power, open a faucet, and turn the pump on. It should prime and deliver water within 30–60 seconds. Check every hose connection for drips while the pump runs. Tighten any leaking clamp while wet — don't wait until you close up the compartment.
Vibration noise after installation?
All RV pumps vibrate and make noise when running — that's normal. Excessive noise usually means the pump is mounted to a hard surface that amplifies vibration. Add a piece of closed-cell foam or rubber mat between the pump base and the mounting surface. Some replacement pumps include a foam pad — use it if yours does.
Common Question
How long does it take to replace an RV water pump?
Most straightforward replacements take 30–60 minutes for someone following instructions for the first time. If the pump is in a difficult location or the old fittings are corroded and stuck, budget 90 minutes. A mobile tech who does this regularly is typically done in 20–30 minutes.
Common Question
What's the best RV water pump replacement?
The Shurflo 2088 series is the most widely used and reliable replacement for standard rigs. It's well-supported, parts are available, and it fits the vast majority of existing plumbing setups. For higher-demand rigs, the Shurflo 4008 or Flojet equivalent at 4.0 GPM is the step up.
Common Question
How do I know if my RV water pump is bad?
A failed pump typically shows one of these: runs constantly without building pressure (pressure switch or seal failure), makes grinding or clicking noises without moving water (mechanical failure), no response at all when switched on (electrical failure). Before condemning the pump, confirm you have 12V at the pump terminals and the inlet strainer is clean.
If the pump is in a difficult location or you'd rather not deal with it, we handle water pump replacement on-site throughout Redding and all of Northern California. Learn about our RV plumbing repair service.
BossBros RV Team
Redding, CA