Is Your Pressure Washer Ready for Spring? Here’s What to Check
Spring in the Hill Country means it’s time to blast the winter off everything — the driveway, the fence, the deck, the truck. There’s nothing more satisfying than running a pressure washer across a dirty surface and watching months of grime disappear in seconds.
Until it won’t start.
I get more pressure washer repair calls in March and April than almost any other time of year. Someone pulls their machine out of the garage after sitting all winter, yanks the cord a dozen times, and gets nothing. Or it starts rough and dies. Or it runs but has no pressure.
If that sounds familiar, you’re not alone — and you don’t have to haul it anywhere. Doc Wally’s Mobile Small Engine Repair comes right to your driveway in New Braunfels and the surrounding area. Here’s what’s likely going on and what we can do about it.
Key Takeaways
- Most pressure washer problems after winter storage are fuel and carburetor related
- Old gas left in the tank is the #1 cause of spring startup failures
- Low or no pressure is usually a pump, unloader valve, or nozzle issue
- Regular seasonal maintenance prevents most common breakdowns
- Doc Wally’s services pressure washers on-site throughout New Braunfels, Schertz, Cibolo, Bulverde, Canyon Lake, and the surrounding Hill Country
Why Pressure Washers Fail After Sitting
Gas-powered pressure washers have two main systems that can give you trouble: the small engine that runs the whole unit, and the pump that actually builds water pressure. When a machine sits for months, both systems are at risk.
On the engine side, gasoline starts to break down in as little as 30 days. The ethanol in modern pump gas attracts moisture, and once that moisture gets into the carburetor, the fuel jets clog with gummy deposits and the engine won’t run properly — or at all. This is the most common reason I see pressure washers that “just don’t start” in the spring.
On the pump side, seals and o-rings can dry out when the machine sits unused. If the pump wasn’t properly winterized — meaning it was run with pump protector fluid before storage — those seals may have degraded and will leak or fail to build pressure when you fire it back up.
Most Common Pressure Washer Problems I See
Won’t Start or Hard to Start
This is the call I get most often in spring. You stored it in October, it’s April now, and it won’t fire.
Stale fuel and a clogged carburetor. Old gasoline is enemy number one. The volatile components evaporate, leaving behind a varnish that coats the carburetor jets and passages. The fix is a carburetor cleaning — sometimes a simple spray-out, sometimes a full disassembly and rebuild. Once I clear it out and put in fresh fuel, most engines start right up.
Fouled or old spark plug. If the engine is cranking but not firing, a worn or carbon-coated plug is often the culprit. I check and replace plugs as part of any tune-up. A new plug costs a few dollars and is one of the most overlooked maintenance items.
Air filter restriction. A clogged paper or foam air filter chokes the engine. This is especially common if the machine was stored in a dusty garage or shed. If it runs but bogs down under load, check the filter first.
Runs But Has No Pressure (or Low Pressure)
This one frustrates people because the engine sounds fine, but the water coming out of the wand is barely better than a garden hose.
Clogged or wrong nozzle. Start here — it’s the easiest fix. Debris can partially block a nozzle tip, dropping pressure significantly. Try swapping to a different nozzle and see if pressure improves. Also make sure you’re using the right nozzle for the job — a wide-angle tip will always feel weaker than a narrow one.
Unloader valve stuck or worn. The unloader valve regulates pressure inside the pump. If it’s stuck open, pressure bleeds off and you get weak output. This valve is a common wear item on older machines and can usually be replaced without replacing the whole pump.
Pump seal failure. If the machine wasn’t winterized properly, internal pump seals may have dried out and cracked. A pump that’s pulling in air instead of water won’t build pressure regardless of how well the engine runs. Depending on the machine, seals can sometimes be replaced; on budget machines, a pump replacement is often more practical.
Water supply issue. This one gets missed all the time. If your garden hose can’t supply water fast enough — from a partially kinked hose, a weak spigot, or a too-long hose run — the pump starves and can’t build pressure. Always run the shortest, most direct water supply line you can.
Engine Surging or Running Rough
If the engine cycles up and down in RPM (a “hunting” sound), or bogs under load and then recovers, it’s almost always a carburetor issue. The main jet is partially restricted, so the engine can’t get a consistent fuel supply.
This is especially common on cheaper carburetor designs and on machines that have sat with fuel in them. A carburetor cleaning almost always resolves surging issues.
Pressure Washer Leaking Water
Leaks usually show up at hose connections, the wand trigger gun, or from the pump itself. Connection leaks are often just a missing or worn O-ring — a two-minute fix. Trigger gun leaks usually mean an internal valve is worn. Pump housing leaks are more serious and may indicate a cracked housing or a fitting that’s backed out.
I see a lot of people just tighten connections and keep running a leaking machine. Don’t do this — you’re losing pump efficiency and potentially damaging the unit further. Get the leak addressed early.
Pressure Washer Seasonal Maintenance Checklist
If you want your pressure washer to start every single time you pull it out, this is the maintenance routine that keeps them running:
Before every use:
- Check engine oil level (never run a pressure washer low on oil — pump failure follows quickly)
- Inspect hoses and connections for cracks or loose fittings
- Check that the water supply is flowing fully before starting the engine
- Run water through the system before starting the engine to purge air from the pump
Every season (or annually):
- Change the engine oil — typically SAE 30 for warm-weather use
- Replace the air filter if dirty or damaged
- Inspect and replace the spark plug
- Clean or rebuild the carburetor if starting has been difficult
- Inspect all spray nozzles for wear or clogging; replace as needed
- Check the pump oil level if your machine has a separate pump oil reservoir (many do)
Before winter storage:
- Add a fuel stabilizer to the gas tank OR drain the fuel completely
- Run the engine for a few minutes to get treated fuel through the carburetor
- Run pump protector fluid through the pump to lubricate and protect internal seals
- Store in a dry location, protected from freezing temperatures
That last step — pump protector fluid — prevents most of the pump seal failures I see in spring. It costs a few dollars and takes five minutes. I wish more people knew about it.
Gas vs. Electric Pressure Washers: Does It Matter?
I should be clear: Doc Wally’s specializes in gas-powered small engines. Electric pressure washers are a different animal — when they fail, it’s usually a motor or circuit board issue, and those repairs require a different skill set.
If you’ve got a gas-powered pressure washer — a Honda, Briggs & Stratton, Kohler, or Kawasaki engine — that’s what I work on. Gas machines are generally more powerful and longer-lasting anyway, and they’re what I see on most properties out here in the Hill Country.
Why Mobile Pressure Washer Repair Is the Right Call
Think about what it takes to bring a pressure washer to a shop. You’ve got a heavy machine, a high-pressure hose, a wand, and all the attachments to load up, haul in, and then haul back. And then you wait — days or weeks — for them to get to it.
With Doc Wally’s, you don’t move a thing. I come to your driveway with the tools and parts to diagnose and fix most issues on the spot. Carb cleaning, plug swap, oil change, nozzle replacement — almost everything is a same-day repair. If I need to order a specific part, I’ll let you know and schedule a follow-up.
I cover New Braunfels and the surrounding ZIP codes: Schertz, Cibolo, Bulverde, Canyon Lake, Spring Branch, and the rest of the Hill Country within about 25 miles. If you’re not sure whether I come out your way, just give us a call.
Ready to Get Your Pressure Washer Running Again?
Spring in Texas waits for no one. If your pressure washer is giving you trouble — won’t start, no pressure, running rough — don’t let it sit another week while the pollen piles up on your driveway.
Give Doc Wally’s a call and we’ll come out, get it diagnosed, and get it fixed. One visit, right at your property, no shop drop-off required.
Doc Wally’s Mobile Small Engine Repair — Serving New Braunfels, Schertz, Cibolo, Bulverde, Canyon Lake, and the Texas Hill Country