12V vs Gas Soft Wash Pumps

Intro: Not All Pumps Are Created Equal

When it comes to soft washing, the pump you choose can make or break your setup. Usually, the choice comes down to two types: 12V or gas. Both have their place in the industry, and both get the job done but in different ways. Depending on what kind of work you’re doing (and how often you’re doing it), one pump might save you time, money, and stress, while the other ends up collecting dust.

What’s the Difference? (And What’s Best For You)

12V and gas-powered soft wash pumps are both used by pros in the industry, but they’re made for different kinds of work. If you try to use a 12V pump for high-demand commercial jobs or rely on a gas pump for a couple of residential roofs a week, you’ll either burn out your gear or overpay for power you don’t need.

Here’s what sets them apart:

Comparison Table: 12V vs Gas Soft Wash Pumps

What’s Best For You?

Troubleshooting & Real-World Considerations

No matter how solid your setup is, things can (and will) go wrong out in the field. Soft wash pumps, especially when used daily, take a beating so knowing the common issues and how to work around them can save you a lot of time, money, and stress.

Let’s break down what to watch out for:

12V Pump Issues and Fixes

Pump burnout

• Happens when the pump is run dry or used non-stop without cool-down.
• Always prime the pump and avoid letting tanks run empty.

Low pressure or flow

• Can be caused by air getting into the system from fitting connections.
• Double check connections are wrapped with thread tape or thread sealer and tightened.

Blown fuses or random shutoffs

• Caused by corrosion or bad wiring connections, especially in humid setups.
• Use marine-grade connectors, seal your wiring, and check regularly for rust or damage.
• Also have some extra fuses on hand if your pump has replaceable fuses.

Pump won’t shut off

• The pressure switch may be shot due to SH exposure.
• Replace the switch to restore functionality.

Cracked pump housing or diaphragm damage

• Caused by leaving SH in the pump or freezing weather.
• Always flush your system after each job and winterize before cold temps hit.

Pro tip

• Keep a spare 12V pump or at least an extra pump head on your rig. It’s cheap insurance and easy to swap out in under 30 minutes.

Gas Pump Issues and Fixes

Hard to start or won’t start

• Usually from old gas, water in gas, or a dirty carburetor.
• Use ethanol-free gas, keep a tight lid on your gas can, and clean your carb occasionally.

Pressure loss mid-job

• Can be air getting into the system
  • Check connections
• Possible debris stuck in pump check valves preventing pressure formation
  • Open up pump and examine and clean valves
• Possible damaged diaphragms resulting in pressure leakage
  • Replace diaphragms to restore pressure
• Could be a stuck unloader that is constantly in bypass mode
  • Inspect your unloader and pump internals every few weeks if used daily.

Overheating

• Happens when the system is running too long in bypass mode.
• Shut off your unit if it’s not being used for more than 5 minutes.

Oil leaks or burnt oil

• Caused by skipped maintenance or overuse.
• Stick to the recommended oil change intervals (usually every 50–100 hours).

Freezing damage

• Water left in the pump will expand and crack components in freezing weather.
• Always flush and winterize with antifreeze before storage.

Pro Tip: In Case Your Pump Fails Mid-Job…

Even with regular maintenance and a solid setup, pumps still burn out, wires short, and leaks happen. It usually hits right when you’re already halfway through a job!

That’s why it helps to have a simple backup on hand, just in case–

Introducing the X-Jet M5, a high flow downstream injector that utilizes your pressure washer to dispense SH mix in a pinch. It connects to the tip of your pressure washing gun and pulls bleach from a bucket or tank. It’s quick to set up and gets the job done when your regular equipment isn’t cooperating.

It’s also useful for small or fast jobs where setting up the full rig would just slow you down.If you don’t already have one, pick one up ASAP for a reliable backup that keeps you working even when your pump calls it quits.

Recommendations & Final Takeaways

When it comes to choosing between a 12V and gas-powered soft wash pump, there isn’t a one-size-fits-all answer. The right choice will depend on how often jobs are being taken, the type of properties being cleaned, and how much is being invested up front.

Whether a system is being built from scratch or upgraded after a busy season, it’s always smarter to invest based on actual needs, not just future plans or what other people are running.

If gas-powered systems are being considered, the Comet P40 and AR45 have been trusted by many pros for their performance and reliability. 

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But if you’re leaning toward a 12V setup, we recommend checking out the Everflo Soft Wash Pump. It’s simple, affordable, and comes in multiple GPM options with matching repair kits available.

Just remember, even the best equipment needs to be paired with the right mindset: take care of your setup, use it for what it’s built for, and let it grow with you.

Check out these related articles below:

Best Soft Wash Pump 2025: P40 vs AR45

This is Not a Soft Wash Pump!!

Essential Soft Washing Tools