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Gilbert Pro Pressure Washers: What They Do and Who They're Built For

By Constance Obi · Culture & Recreation Writer

What the Gilbert Pro is and what it cleans

The Gilbert Pro is a gas-powered pressure washer made by Generac, designed for homeowners and small contractors who need more power than a basic electric model but don't want commercial-grade equipment. It produces around 3,100 PSI (pounds per square inch) and flows about 2.5 gallons per minute, which puts it in the mid-range for residential pressure washers—strong enough to strip paint, clean concrete driveways, and blast away years of grime from siding, but not so powerful that it damages wood or requires special training to operate safely.

The machine runs on gasoline and comes with a 208cc engine. Because it's gas-powered, it doesn't need to be plugged in, so you can use it anywhere on your property without running extension cords. The trade-off is that you'll need to maintain the engine—changing oil, cleaning the spark plug, and winterizing it if you live somewhere cold.

Key Takeaways

  • The Gilbert Pro produces 3,100 PSI and 2.5 GPM, making it suitable for driveways, decks, siding, and concrete surfaces but not ideal for delicate materials like wood shingles.
  • It runs on gasoline with a 208cc engine, so it requires regular maintenance including oil changes and seasonal care.
  • The machine is portable and doesn't require an electrical outlet, but you'll need to store fuel safely and deal with engine noise.
  • Setup involves assembling the frame, attaching the hose, filling the tank, and priming the engine before first use.
  • Repair parts and service are available through Generac dealers and online retailers, though some repairs are best handled by a professional technician.

Power level and what surfaces it handles

At 3,100 PSI, the Gilbert Pro sits in the sweet spot for most residential cleaning jobs. It will remove stubborn dirt, mold, and algae from concrete, brick, and vinyl siding without gouging or pitting the surface the way a 4,000+ PSI machine might. It can strip old paint from wooden fences and decks, though you need to keep the nozzle moving and maintain proper distance to avoid splintering the wood.

The machine is not the right choice for delicate surfaces. Wood shingles, asphalt shingles, and soft materials like stucco can be damaged by the pressure, even at this level. For those jobs, you'd want a lower-PSI electric model or a professional with adjustable pressure settings. The 2.5 GPM flow rate means the job takes longer than a high-flow commercial machine, but it uses less water and is easier to handle for extended periods.

Fuel, maintenance, and storage

The Gilbert Pro uses regular unleaded gasoline, and you'll need to keep fuel on hand. Store gasoline in an approved metal or plastic container in a cool, dry place away from your home. Before the first use and at the start of each season, you should check and change the oil, inspect the spark plug, and run the engine briefly to make sure it starts cleanly. If you live in a cold climate, drain the fuel tank and run the engine dry before storing it for winter, or add a fuel stabilizer to prevent the carburetor from gumming up.

The engine requires an oil change every 50 to 100 hours of use, depending on the manual's guidance. Air filters should be checked regularly and replaced if they look clogged with dirt. The pump and hose also need care: rinse the system with fresh water after each use to prevent mineral buildup, and store the hose coiled loosely (not kinked) in a shaded spot. Neglecting these steps can lead to starting problems, reduced pressure, or leaks.

Getting it ready to use

Out of the box, the Gilbert Pro arrives partially assembled. You'll need to attach the frame, connect the high-pressure hose to the pump outlet, and screw the nozzle onto the hose end. Fill the engine oil reservoir to the marked line, then add fresh gasoline to the fuel tank. Check that the water inlet is connected to a garden hose with adequate flow—low water pressure can damage the pump.

Before you start the engine, set the choke to the cold-start position (usually marked on the engine). Pull the recoil starter cord firmly and steadily until the engine catches. Once it's running, let it warm up for a minute, then move the choke to the run position. Squeeze the trigger on the spray gun to prime the pump and release air from the lines; you may see sputtering or weak spray for the first 10 to 20 seconds. Once the spray is steady and strong, you're ready to work.

Nozzles, attachments, and spray patterns

The Gilbert Pro comes with interchangeable nozzles that change the spray pattern and pressure. A 0-degree nozzle produces a tight, powerful stream for heavy-duty cleaning but can damage surfaces if held too close. A 15-degree nozzle is better for general-purpose work on concrete and siding. A 25-degree nozzle spreads the water over a wider area and is gentler on wood and delicate surfaces. A 40-degree nozzle is the softest and best for rinsing or cleaning windows.

Some models include a soap dispenser attachment that draws detergent from a bucket and mixes it with the water stream. This is useful for cleaning large areas, though you'll need to rinse thoroughly afterward to remove all soap residue. Always start with the widest nozzle angle when cleaning an unfamiliar surface, then switch to a narrower angle if needed. Test on a hidden area first to see how the surface reacts.

Common problems and troubleshooting

If the engine won't start, check that the fuel tank has fresh gasoline and the oil level is correct. A clogged spark plug or a flooded engine (too much fuel) can also prevent starting; consult the manual for the specific steps to clear a flood or replace the plug. If the machine starts but produces weak pressure, the pump may be air-locked (run water through it for a minute), the nozzle may be clogged (soak it in vinegar or replace it), or the water inlet may be blocked.

Leaks from the pump or hose connections usually mean a fitting needs to be tightened or a seal has failed. Tighten all connections by hand first; if the leak continues, the seal may need replacement. If the engine stalls during use, the fuel filter may be dirty, or the carburetor may need cleaning. These repairs are often manageable at home with basic tools, but if you're unsure, a Generac-authorized service center can diagnose and fix the problem.

Where to find parts and service

Generac dealers across South Carolina stock replacement parts for the Gilbert Pro, including hoses, nozzles, spark plugs, oil, and pump seals. You can also order parts online from retailers like Amazon, eBay, and Generac's official website. Keep your model and serial number handy when ordering; they're printed on a label attached to the frame.

For warranty service or complex repairs, contact an authorized Generac service center. Many hardware stores and outdoor equipment shops in South Carolina offer repair services as well. If you're handy and comfortable working on small engines, the manual includes diagrams and step-by-step instructions for routine maintenance and common fixes. Always disconnect the spark plug wire before working on the engine to prevent accidental starting.

Frequently Asked Questions

Can I use the Gilbert Pro to clean my car?

Yes, but with caution. Use the 40-degree nozzle and keep the spray at least two feet away from the car's surface. Avoid spraying directly at windows, door seals, or the undercarriage, where high pressure can force water into sensitive areas. Test on a small area first, and never use hot water or harsh detergents that could damage the paint.

How loud is the Gilbert Pro?

Gas-powered pressure washers are typically 85 to 90 decibels, roughly as loud as a lawnmower. This is loud enough to require hearing protection if you're using it for extended periods. Check local noise ordinances before using it early in the morning or late in the evening, as some neighborhoods have restrictions on equipment noise.

What's the difference between PSI and GPM, and why do both matter?

PSI measures the force of the water spray; higher PSI cleans tougher dirt but can damage delicate surfaces. GPM measures the volume of water flowing per minute; higher GPM cleans faster and covers more area. The Gilbert Pro's 3,100 PSI and 2.5 GPM combination is good for general residential work, but a job requiring fast coverage might benefit from a higher-GPM model.

Do I need to winterize the Gilbert Pro if I use it year-round?

If you live in a region where temperatures drop below freezing, yes. Drain the fuel tank, run the engine dry, and store it indoors in a dry place. If you plan to use it occasionally during winter, add fuel stabilizer to the tank before storage. In warmer parts of South Carolina, winterization is less critical, but you should still drain the system if the machine will sit unused for more than a month.

Can I rent a Gilbert Pro instead of buying one?

Many equipment rental shops in South Carolina rent pressure washers by the day or week, including models similar to the Gilbert Pro. Renting makes sense if you need the machine for a one-time project. If you plan to use it several times a year, buying is usually more economical over time.