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Model#: GRCN5991

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Brand new items;Full manufacturer warranty available
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New or Recon items with possible minor cosmetic damage; CPO 60 day money back guarantee
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Generac 5991 3,000 PSI 2.7 GPM Gas Pressure Washer

  • Generac 5991 3,000 PSI 2.7 GPM Gas Pressure Washer
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A medium duty pressure washer, this unit offers more power which means quicker and more efficient cleaning. The larger engine provides a steadier pump cycle and longer machine life. For intense do-it-yourselfers with tough cleaning jobs. Good for driveways and sidewalks, decks, gutters and any medium job.
Get cleaning power, reliability and - above all - ease of use in an affordable, compact design you can use to clean everything from patio furniture to driveways and decks.
  • Features a Generac horizontal-shaft OHV engine with the pump at the same level as the engine, making hose connections easy
  • Engine and pump are perfectly balanced over the axle for almost effortless maneuverability, regardless of the terrain
  • Durable welded frame for long life
  • Compact design for easier storage while not in use
  • Easy access to engine controls; On/Off switch, choke, fuel shut-off
  • Built-in step makes starting the engine a breeze
  • The Generac horizontal-shaft OHV engine also ensures that the pump and hoses are kept well above the ground to avoid snags and the integrated gun holster prevents gun from falling off
  • 212cc Generac OHV engine features a low-oil shutdown (only available on Generac pressure washers!)
  • Features two 3/4 gallon soap tanks
  • Axial cam pump
  • Generac Deluxe Spray gun features a soft grip to reduce fatigue
  • The inverted fulcrum spray trigger can be pulled and held with minimal effort
  • Spray gun comes with an adjustable auxiliary handle for additional comfort and control when cleaning up high, down low, or anywhere in between
  • Unit not for use or sale in California, CARB compliant units available
  • 3,000 PSI 2.7 GPM Gas Pressure Washer - 5991
  • Deluxe Spray Gun
  • Adjustable Auxiliary Handle
  • 30 ft. High Pressure Hose
  • (2) 3/4 Gallon Soap Tanks
  • (5) Quick-Click Nozzle Tips (0 Degrees, 15 Degrees, 25 Degrees, 40 Degrees, Soap)


CARB Compliant: No
Chemical Injection Method: Siphon Tube
Engine Displacement: 212cc
Engine Make: Generac
Frame Type: 2-Wheel Cart
Fuel Tank Capacity: 3.2 qt.
Hose Connection: Quick Connect
Hose Diameter: 3/8 in.
Hose Length: 35 ft.
Hose Material: Rubber
Max. Water Flow Rate (GPM): 2.7
Max. Water Pressure (PSI): 3000
Pump Type: Triplex Plunger
Spray Gun Connection: Quick Connect
Spray Gun Nozzle: Quick Connect
Spray Gun Tips Included: 5
Starting System: Recoil
Water Temperature: Cold
Wheel Size: 10 in.



4.7 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend?
Yes (11)
Powerful (9)
Lightweight (3)
Yes, I would recommend this to a friend
This machine would work commercially.
This machine is so powerful that you need to re-evaluate the nozzle that you use. It will blast years old concrete oversplash off any surface. My only complaint is the way that it's handle is packed making it prone to damage by careless freight handlers. The engine is a slant cylinder type Generac and is super easy to start, even just out of the box. The slant cylinder means that it's not fighting gravity and will last longer. Only had this two weeks but nothing has bested it so far.
June 30, 2012
Yes, I would recommend this to a friend
Generac Gas is the way to go
So far working fine judging durability will require more time.
July 4, 2012
Yes, I would recommend this to a friend
Simple to use and gets the job done
The pump is perfectly located. It is completely exposed for easy connections.
July 8, 2012
Yes, I would recommend this to a friend
I took it out of the box, assembled in under 5 minutes, and put it to use. Five hours later it was still going strong. I cleaned the unit and continued the next day for 3 more hours.

The unit is a workhorse and was everything I expected it to be and more. Spend the extra money and get the best! Generac is my choice whenever the opportunity arises!
September 13, 2012
Yes, I would recommend this to a friend
3000 psi Generac power washer
The product came on time, the delivary person was very courteous. It came in good condition. Everything is in the box. It is severe cold and bad weather in the North East. I did not take it out of the box to check it. I will do that only in the spring. Hopefully it will work as the expectation. The customer relationship is great from CPO Generac. Thanks.
November 8, 2012
Yes, I would recommend this to a friend
November 23, 2012
Yes, I would recommend this to a friend
very good product!
This pressure washer is very easy to start.It's has plenty of power to clean everything i used it on.I was very pleased!
February 9, 2013
Yes, I would recommend this to a friend
Generac 3000 PSI Pressure Washer
Received in good condition. Added included oil. Hooked up easily and started on the third pull. Used it cleaning a concrete patio for 2 hours straight with no problems except having to add gas regularly. It's a bit loud and not the smoothest running engine, but not really a con. Very happy so far!
May 1, 2013
Yes, I would recommend this to a friend
Happy overall
first use, the pressure hose got a bulge int it.
I called Generac service, talked to a pleasant person. I called after 5 on a Friday, got new hose on Tuesday. No problems.
Starts easy, runs well.
Haven't used the soap injection yet.

The pump suction and discarge are close, making it a little hard to get the garden hose on and off.
That's the only problem I have with the unit
June 24, 2012
Yes, I would recommend this to a friend
will not start & damage from shipping
Foreign object in starter clutch & damage from shipping. Called CPO & told to contact Generac & repaired at local auth. Generac repair center paid $30 repair not covered by warranty.

Questions & Answers

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Browse 3 questions Browse 3 questions and 3 answers
I have a model 6024-2 which when water is hooked up to it and it is just sitting idle I noticed that there seems to be an erratic speed variation that can be heard, and at no time does the thermal relief open. The question is why does it idle like this when running and the wand is not being used, and why have I not seen the thermal relief open no mater how long it runs? I purchased the unit on 10-20-13 and it seems to be out of the labor part of the warranty by a week which is not good.
Steve on Oct 27, 2014
BEST ANSWER: Please contact Generac directly for technical assistance at 888-436-3722 regarding the above issue.
This is my first pressure washer with a detergent tank, so I have a couple of questions about it's usage. Can you give me some guidance on the following:

1) What is the approx. mix ratio? That is, for every 2.7 gpm, how much of the 3/4 gal. tank is used? For every gallon of water, approx. how much (ounces/millileters) is siphoned from the 3/4 gal tank.

2) What type of detergents can be used?

3) Can you give me an idea of what brand(s) of detergents might be useful for various cleaning jobs, i.e., can I use Windex in the tank to clean windows?, can I use '409' Cleaner for "???", can I use ammonia for cleaning (do I need to dilute it in the tank)?, any more ideas on how / what might be a good material, mix ratios, etc? HOw about high suds/grease cutters like "Dawn detergent"?
FM by Ferrara on May 25, 2013
BEST ANSWER: The ratio would determine what chemical you are using. Each item is concentrated and the mixture is listed on the bottle of chemical. You should not use over the counter items to wash windows, remove grease or wash a deck or patio in a pressure washer. Here is a link to the chemical we stock in our warehouse:
what are te shipping dementions of the box its shipped in
length width height and shipping weight
Russ on Apr 11, 2013
BEST ANSWER: The dimensions of the box are:
27" deep, 17-3/4" wide and 20-5/8" high. The shipping weight is 74.6 pounds.



For a period of two years from the date of original sale, Generac Power Systems, Inc. (Generac) warrants its Pressure Washers will be free from defects in materials and workmanship for the items and period set forth below. Generac will, at its option, repair or replace any part which, upon examination, inspection and testing by Generac or a Generac Authorized Warranty Service Dealer, is found to be defective. Repair or replacement pursuant to this limited warranty shall not renew or extend the original warranty period. Any repaired product shall be warranted for the remaining original warranty period only. Any equipment that the purchaser/owner claims to be defective must be returned to and examined by the nearest Generac Authorized Warranty Service Dealer. All transportation costs under the warranty, including return to the factory, are to be borne and prepaid by the purchaser/owner. This warranty applies only to Generac Pressure Washers and is not transferable from original purchaser. Save your proof-of-purchase receipt. If you do not provide proof of the initial purchase date, the manufacturer’s shipping date of the product will be used to determine the warranty period.

***This Warranty only applies to units sold for use in the US and Canada.***


Consumer applications are warranted for two (2) years.


YEAR ONE – Limited comprehensive coverage on Labor and Part(s) (proof of purchase and maintenance is required):

  • • All Components

YEAR TWO - Limited comprehensive coverage on Part(s) (proof of purchase and maintenance is required):

  • • Engine only – Major components including: Block, head, crank, cam, rods and pistons.

NOTE: For the purpose of this warranty “consumer use” means personal residential household or recreational use by original purchaser. Any use of the Pressure Washer in a commercial or rental application will void the warranty.


  • • The customer is responsible to read and follow all operating instructions.
  • • Products that are damaged due to improper operation, will not be covered by warranty. This includes water pump components that are started without the required water flow and pressure.
  • • The customer will be responsible to transport the product to an authorized Generac repair facility for all Warranty All Components.
  • • Verification of maintenance may be requested for coverage of Warranty Repairs.
  • • Warranty Labor Rates are based on normal working hours. Additional costs for overtime, holiday or emergency labor costs for repairs outside normal business hours will be the responsibility of the customer.
  • • Warranty Parts shipment costs are reimbursed at ground shipment rates. Costs related to requests for expedited shipping will be the responsibility of the customer.


  • • Generac pressure washers that utilize non-Generac replacement parts.
  • • Costs of normal maintenance and adjustments.
  • • Failures caused by any contaminated or improper fuels, oils or lack of proper oil levels.
  • • Repairs or diagnostics performed by individuals other than Guardian/Generac authorized dealers not authorized in writing by Generac Power Systems.
  • • Failures due, but not limited, to normal wear and tear, accident, misuse, abuse, negligence or improper use. As with all mechanical devices, the Generac engines need periodic part(s) service and replacement to perform as designed. This warranty will not cover repair when normal use has exhausted the life of a part(s) or engine.
  • • Failures caused by any act of God and other force majeure events beyond the manufactures control.
  • • Water freezing in the pump (water must be drained from the pump at the end of the season in freezing climates).
  • • Damage related to rodent and/or insect infestation.
  • • Products that are modified or altered in a manner not authorized by Generac in writing.
  • • Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or replacement of the defective part(s).
  • • Failure due to misapplication.
  • • Expenses related to “customer instruction” or troubleshooting where no manufacturing defect is found.
  • • Rental equipment used while warranty repairs are being performed.
  • • Starting batteries, fuses, filters, light bulbs and engine fluids.

THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, SPECIFICALLY, GENERAC POWER SYSTEMS MAKES NO OTHER WARRANTIES AS TO THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Any implied warranties which are allowed by law, shall be limited in duration to the terms of the express warranty provided herein. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to purchaser/owner.

GENERAC POWER SYSTEMS ONLY LIABILITY SHALL BE THE REPAIR OR REPLACEMENT OF PART(S) AS STATED ABOVE. IN NO EVENT SHALL GENERAC POWER SYSTEMS BE LIABLE FOR ANY INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF SUCH DAMAGES ARE A DIRECT RESULT OF GENERAC POWER SYSTEMS, INC. NEGLIGENCE. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations may not apply to purchaser/owner. Purchaser/owner agrees to make no claims against Generac Power Systems, Inc. based on negligence. This warranty gives purchaser/owner specific legal rights. Purchaser/owner also may have other rights that vary from state to state.