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Generac Semi-Pro 3100 PSI (Gas - Cold Water) Pressure Washer

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Generac Pressure Washers and Accessories
Model: 6590
(Based on expert analysis, manufacturer ratings and customer reviews)
3.7 out of 53.7 out of 53.7 out of 53.7 out of 53.7 out of 5
37 Reviews
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  • Features
  • Specs
  • 2
    Q&A 
  • 37
    Reviews
  • Articles
  • Accessories
Grade
Style
Water Pressure
3100
PSI
Water Flow
2.8
GPM
Cleaning Speed
8680
Cleaning Units
Engine
Generac
Powerful 5.5 HP Generac 212cc OHV Engine
Easily handles household & small business cleaning
On/off fuel switch & low oil shutdown for easy operation

Professional Grade AR Triplex Plunger Pump
Adjustable pressure regulator for complete pressure control

Welded Steel Frame
Folding handle rotates forward for compact storage & transport
Perfectly balanced for easy manueverability (color may vary)
3" x 10" NeverFlat tires take on all kinds of terrain

Ergonomic Generac Pro-Style Spray Gun & 20" M22 Wand
Adjustable side handle & soft grip for precision control, comfort

Adjustable Pressure
Complete control of water pressure for all applications

5 Quick Connect Nozzle Tips
0, 15, 25, 40, and soap applicator with on-board storage

35 Feet Of High Pressure Hose With Quick Connects
Non-marring 5/16" steel reinforced polyurethane stores on hook

Generous Factory Warranty
3 years through Generac's nationwide service network

Not For Sale To California- Does Not Meet CARB Requirements


Engine
Engine Brand
Generac
Starter
Recoil
HP
5.5 HP
CC
212 CC
Fuel Tank Size
3.2 quarts
Pump
Pump Brand
AR
Pump Type
Triplex Plunger
Adjustable Pressure
Yes
Chemical Injection
Siphon Tube
Water Temperature
Cold
Water Pressure
3100 PSI
Water Flow
2.8 GPM
Housing
Frame Type
2-Wheel Cart
Wheels
NeverFlat
Hose
Hose Storage
Hook
Hose Length
35 Feet
Hose Material
Wire Reinforced
Hose Diameter
5/16 Inch
Hose Connections
Quick-Connect
Spray Gun
Spray Gun Connection
Quick-Connect
Spray Gun Grade
Professional
Spray Gun Wand
Single Wand
Spray Tips
Quick Connect Tips (5)
Turbo Nozzle
Sold Separately
Overview
Weight
102.5 Pounds
Product Length
31.8 Inches
Product Width
24.3 Inches
Product Height
38 Inches
Consumer Warranty
3 Years
Commercial Warranty
90 Days
UPC
696471065909
Model
6590
  2 Questions
Q: ON ANY OF YOUR 3100 PSI AND WITH A Siphon Tube. IF I HUNG A 1 GAL BOTTLE OF SOAP ON THE HANDLE WILL IT WORK OR DOES THE BOTTLE NEED TO BE ON THE GROUND
by LEON GWIAZDOWSKI from New Jersey on June 03, 2015

A: You can put a bottle anywhere the siphon hose can reach. However, you can't add additional lengths of siphon hose to the unit. This will cause the unit to not be able to draw detergent.
by Brian, Product Expert

Q: I'm retiring soon from the military and am in the beginning stages of researching pressure washing as a small business. I would be more than happy to receive any tips you may have on the subject. Thank you for providing a solid breakdown on the equipment you sell on this website. How would you compare the DR pressure washer with the prosumer models listed here?
by (Mr.) Ashley Holt from Virginia on May 03, 2014

A: I am not sure of the DR brand you are referring to. However, the Generac Prosumer model is a great choice. It uses a High Quality AR Triplex Plunger Pump with adjustable pressure. The AR pump is one of the best in the industry today. I would highly recommend the Generac brand.
by Brian, Product Expert

Generac 6590 Reviews & Ratings
Overall Rating
Features
4/5
Quality
4/5
Performance
3/5
Value
4/5
Overall
3.7 out of 53.7 out of 53.7 out of 53.7 out of 53.7 out of 5
Pros
Features (7)
Easy To Use (6)
High Quality (5)
Durable (5)
Easy To Store (3)
Cons
Unreliable (11)
Low Quality (3)
None Yet (3)
Packaging (2)
Durability (1)
57% of respondents would recommend this product to a friend
37 Reviews  Sort by 
 
Andre L.
Erath, LA
Most Helpful Critical Review
REVIEWED
JUN.
27
2017
3 out of 53 out of 53 out of 53 out of 53 out of 5
Machine Performs, When It's New....
I've been having this unit for approx 18 months. Worked well during the first year. I'll add the machine is maintained by a mechanic and is properly serviced and stored. I had one issue with the chemical injector gumming up, so I removed it and lost the spring. I ended up using a plug and I no longer use the chem inj. No big deal.

Out of no where, I started having issues with the motor stalling during pump use. RPM's of the engine slow down, it begins to sputter and loses pump pressure... more
Andre Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Andre,
I'm sorry you're having issues with your pressure washer, even if you didn't purchase it from us. You may want to give the folks at Generac a call directly at 888-436-3722, since if a facility is listed as a Generac Repair location, they are supposed to do Generac warranty work- and a call from corporate Generac may motivate them. (Please have the serial number of your unit handy if you call Generac- they will ask for it.)

One thing you might want to try is loosening the gas cap while you work. Sometimes a piece of grit or plastic casting can block the vent hole in the gas cap. Then as the engine uses gas it forms a vacuum in the fuel tank, starving the carburetor and slowing, or stopping, the engine. If this helps, the folks at Generac should be able to send you a new gas cap without your needing to go to a service location.
more
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00
Kevin
Purchased from Pressure Washers Direct
Purchased 4/14/14
Total Helpful Votes
21 Helpful Votes
REVIEWED
MAY.
11
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Stepped Up
Stepped up to this more industrial type pump unit and glad I did. You will spend $200 more over consumer units but this is not just about the pump . The entire unit is better quality from the hoses and connections to the tires to the gauge of metal in the frame its well worth the extra money.

I go to it not wondering if it will start or work that day, only how much I wanna clean!

Love it and Pressure Washers Direct!
Pros: Easy To Use, Price, Exceeded Expectations, I'd Buy It Again
Cons: None Yet, None Yet
Kevin Recommends This Generac Product
Kevin's Experience With Pressure Washers Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Buy here, Period !"
 more
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216
Mike P.
New Castle, PA
Purchased from Pressure Washers Direct
Purchased 4/12/15
Total Helpful Votes
22 Helpful Votes
REVIEWED
JUN.
27
2015
3 out of 53 out of 53 out of 53 out of 53 out of 5
Not As Expected
First time PW purchase. I debated, researched, surfed at several websites, read, planned and shopped in big box stores for 6 months before I bought the Generac 6590. I read every review that I could on very many makes and models of PW's. And, watched many videos. I copied feature lists from supplier and manufacturer websites in addition to key comments and tips from customer reviews. I pasted such info into word pad documents and accumulated comparison notes into spreadsheets.

In April,... more
Pros: Features, Durable, Easy To Use, Quiet
Cons: Light Cleaning Only
Mike Does Not Recommend This Product
Manufacturer Response
Brand Rep
Mike,
Thank you for providing us with your review of the 3100 PSI professional grade pressure washer. We are sorry to learn of the pressure-related issues that you have been experiencing with your unit. It sounds like you may be having issues with the water supply provided to the unit. Considering this, we would recommend verifying that the unit is being provided a supply that can handle at least 3.8 gallons per minute, no less than 30 psi, and does not exceed 100F. Please note that the pressure provided from the unit will also be limited if the unit's water inlet is blocked, the inlet hose screen is clogged, the high pressure hose is leaking, or the connected nozzle is obstructed in any way. If you are able to confirm that all of these potential causes do not apply to your personal unit, we would then recommend contacting an independent authorized service provider in your local area for any required diagnostic work, as our professional grade pressure washers should be able to provide enough power for the cleaning tasks to which you have alluded when the appropriate nozzle is utilized. To locate the independent authorized service provider closest to you, please use your postal code for searching purposes via the following link: http://www.generac.com/dealer-locator?cid=frm-105-ab .

Also, in regards to your current and intended use of the unit, please note that holding the nozzle 1" from your desired surface is not recommended; the spray gun should be held at a safe distance when using different pressure nozzles for various cleaning tasks. This is recommended to avoid damaging the surface to which water pressure is applied. Additionally, we would not recommend ever starting or operating a pressure washer indoors. Even if windows and/or doors are open, indoor operation can lead to overheating issues and a build up of carbon monoxide, which can be deadly. As for your desire to connect a 100' hose to a 35' hose, please note that your unit's owner's manual explicitly states that any connected hose should not exceed 50' in length, as longer hoses would limit the unit's pressure output. If you are interested in referring to your owner's manual, but do not currently possess an applicable copy, please know that you can obtain this documentation online by using the product's model or serial number for searching purposes via the following link: http://www.generac.com/service-support/product-support-lookup?cid=frm-105-ac .

Again, we do apologize for this unfortunate experience. If you would like to discuss your unit's issues with us in further detail, or if you would like to inquire about the process for having your unit serviced, please do not hesitate to contact us directly at 888-GENERAC (436-3722).
more
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229
Tracy G.
Westport, IN
Total Helpful Votes
16 Helpful Votes
REVIEWED
MAY.
19
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Need A Better Gas Cap
I have used my new 3100 pressure washer 3 or 4 times since new and it is very powerful and very well built.

The problem I am having is the gas cap is not venting properly and in order to run the unit more than about 20 minutes, you have to unscrew or completely remove the cap... not good.

A very good pressure washer reduced to junk because of improper fuel tank venting; would not buy again.
Pros: Durable, Features, High Quality
Cons: Unreliable
Tracy Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Tracy,
This pressure washer has a very generous 3 year Factory Warranty on it- you may want to give the folks at Generac a call, toll free, at (888) 436-3722 x5381 and let them know your situation so they can help remedy it.

Please be sure to have the serial number of your pressure washer handy when you call Generac- they will ask for it when you call them.
more
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164
Mike S.
Kettering, OH
Purchased from Pressure Washers Direct
Purchased 4/18/14
Total Helpful Votes
11 Helpful Votes
REVIEWED
JUN.
29
2014
3 out of 53 out of 53 out of 53 out of 53 out of 5
Good Machine But
Purchased in April. Couldn't believe how fast it arrived. Easy to put together. Finally am using it this weekend. Powerful machine but continually stops running on me like it's out of gas. Check the gas and starts right up but will quit again over and over.

Gas cap issues?? I don't know. I guess I will call Generac on Monday 6/30/14
Pros: High Quality, Easy To Use
Cons: Unreliable
Mike Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Mike,
I'm sorry to hear you're having issues getting the engine to run consistently. Calling Generac toll free at 888-436-3722 is a good place to start- please be sure to have the serial number of your pressure washer handy when you call them.

I checked Generac's Service Locator for pressure washer repair locations in your area, and there are 5 within 10 miles of your zip code. If you need Warranty Service, I would suggest calling around to find out who has the shortest turn-around time:

DR. MILLS
5490 WOLFPEN-PLEASANT HILL RD
MILFORD, OH 45150
Distance: 9 Miles
513-831-2206

EDINGTON ENTERPRISES
7210 EDINGTON DRIVE
CINCINNATI, OH 45249
Distance: 1 Miles
513-489-357


TOOL HOUSE INC
11815 HIGHWAY DRIVE
SHARONVILLE, OH 45241
Distance: 4 Miles
513-821-3000


JERICHO MOWER SERVICE
8151 REGAL LANE
WESTCHESTER, OH 45069
Distance: 5 Miles
513-755-6300

PRO TOOL SERVICE INC
1125 GLENDALE-MILFORD RD
CINCINNATI, OH 45215
Distance: 10 Miles
513-772-1490
more
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111
Mark F.
Watkinsville, GA
Purchased from Pressure Washers Direct
Purchased 6/4/14
Total Helpful Votes
12 Helpful Votes
REVIEWED
JUN.
09
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Heavy Duty Unit
This model is very heavy duty from the frame, engine, and pump, to the hose and gun.

For its first use I ran it for around 3 hours to clean the upstairs back of my house and the underneath of my deck from the patio below. Things were very dirty from 2-3 years of no washing. We live in a wooded area with mud wasps, bee hives, birds nests, spider webs, and caked on dirt on the window casings. The pressure treated wood was all gray.

Window casings, bricks, concrete floor, and the pressure... more
Pros: Durable, High Quality, Easy To Store, I'd Buy It Again
Cons: Packaging, Ups Hammered The Box Completely Torn Open On One Side
Mark Recommends This Generac Product
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122
Ruth F.
Sparta, NJ
Purchased from Pressure Washers Direct
Purchased 4/14/15
Total Helpful Votes
15 Helpful Votes
REVIEWED
MAY.
15
2015
2 out of 52 out of 52 out of 52 out of 52 out of 5
Very Disappointing
New out of the box and it won't start! Checked the spark plug - no spark, so I went and purchased a new plug and still no spark. Nearest authorized service center is an hours drive so I spent the afternoon I should have been power washing taking it to the authorized service facility. Who knows when I get it back. No way the manufacturer tested this or did any serious quality inspection. Serves me right for trying to buy American made.
Ruth Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Ruth,
I apologize for the issues you are having. The unit does have a full 2 year warranty and understand your frustration. If you are unsatisfied with Generac's solution to the problem, give us a call at 800-710-7499.
more
Manufacturer Response
Brand Rep
Ruth,
We are sorry to learn of the issues that you are experiencing with your power washer. If you are unable to remedy your unit's issues by completing the tasks recommended in the Troubleshooting section of your unit's owner's manual, we would in fact recommend having the issues diagnosed by an independent authorized service provider. These independent parties are trained to not only determine the cause of any particular issues, but they can also provide any applicable warranty coverage as well. We would like to encourage you to contact us directly at 888-GENERAC (436-3722) if you have any questions about your unit's warranty coverage, or if you would like to speak with us directly regarding your personal experience. Furthermore, we would like to apologize for any inconvenience these issues may have caused.
more
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156
Richard Leb.
Lake City, SC
Total Reviews
5 Reviews
Total Helpful Votes
37 Helpful Votes
REVIEWED
AUG.
07
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Engine Quits
Ditto review from Sam in New Baltimore MI. Great unit when running, but quit 3 times first day I used it. Called Generac and was told by cust service they never heard of this. Had them go into your reviews to validate issue. Mine is in shop now. They couldn't (?) transfer me to anyone in tech support or warranty admin, said only a dealer can do that, (?) Right now I wish I hadn't bought it. We'll see what happens.
Pros: Features
Cons: Unreliable, Engine Quits
Richard Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Richard,
I'm sorry to hear you're having a problem keeping the engine running- I hope you were able to solve the problem the way Sam did by unscrewing the cap enough to let the vapors out?

Generac Tech Support number is 888-436-3722, toll free and accessible to anyone. If you have a problem getting Factory Warranty Service, wherever you bought the unit can ask their sales rep at Generac to step in; they would be the ones to help sort things out with warranty admin.

I'm sorry Generac's customer service rep wasn't aware of the gas cap issue - they are a really large company handling a wide range of power tools, and the information may not have worked all the way through the food chain yet.
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135
Robert G.
Buckannon, WV
Purchased from Pressure Washers Direct
Purchased 6/4/14
REVIEWED
JUN.
25
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Very Pleased
I have owned several consumer type pressure washers and have been disappointed multiple times. Though I have limited time so far using the Generac, it seems to far superior in every respect.

I was very surprised / impressed with how quickly it arrived. I was fully expecting to wait at least a week. As I recall, I ordered on Tues and it arrived by Friday

So far, I could not be more satisfied.
Pros: I'd Buy It Again, Features, High Quality, Fast
Cons: None Yet
Robert Recommends This Generac Product
Robert's Experience With Pressure Washers Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Excellent experience. Delivery time was almost unbelievable. Ordering was easy and info on web site was very helpful."
 more
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80
Fernando L.
Tampa, FL
Purchased from Pressure Washers Direct
Purchased 6/14/15
Total Helpful Votes
11 Helpful Votes
REVIEWED
JUL.
05
2015
3 out of 53 out of 53 out of 53 out of 53 out of 5
Just Out Of The Box And It Will Not Start - First Impressions
I can't remember the last time I bought a machine, especially one that I expected to be of high quality - and it simply did not work.

I've been kicking myself all afternoon for buying American. But that really is not the issue. The fact is that THE PEOPLE WHO MAKE THIS MACHINE DO QUALITY CONTROL VERY BADLY.

I say this because based on the various reviews, some Generac machines work very well out of the box while others (like mine) work like junk.

And this should... more
Pros: Arrived On Time
Cons: Unreliable, Low Quality, Difficult To Use
Fernando Does Not Recommend This Product
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114
Jason B.
Chambersburg, PA
Purchased from Pressure Washers Direct
Purchased 5/15/15
REVIEWED
JUN.
02
2015
2 out of 52 out of 52 out of 52 out of 52 out of 5
Absolute Nightmare So Far
I really was tired of having to service my smaller Troy Built unit so I wanted to purchase something reliable that I could just do my job with and not have the added aggravation of equipment issues...the reviews and quality of Generac had me sold. I made my purchase May 13th and everything arrived on time. Upon assembly I notice that the instruction bag and the bag containing some accessories had been already opened. No big deal really. As I followed thru the directions I noticed I was... more
Jason Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Jason,
All of the units are equipped with a low oil sensor. As the sounds of it, there was not enough oil to start the machine. All of the units are tested from the factory and will have residual oil shipped in it. You still need to add oil for the machine to start.

Also, as far as the shutting down, did you fill the Gas up above the fill line on the tank? This can cause the unit to not vent properly, causing the engine to shut down. I do apologize for all the issues you are having. Generac does cover the engine for defects and lack in workmanship. I know it is frustrating, but the service center will get the unit up and running for you. Any questions give us a call at 800-710-7499. Thanks
more
Manufacturer Response
Brand Rep
Jason,
We are disappointed to learn of the issues that you have experienced with your unit upon purchase and during attempted operation. To acquire any accessories that you currently need, please do not hesitate to contact us directly at 888-GENERAC (436-3722) with your unit's serial number.

In regards to the oil-related issues that you have experienced, please note that the unit is filled with a bit of oil for testing purposes out of manufacturing. Considering this, there may still be oil in the unit upon purchase. Please note, however, that the unit will still need to be appropriately filled with a designated oil. If issues persist after you have filled the unit with oil and followed all of the steps necessary for initial startup, we would then recommend performing the troubleshooting steps detailed in your unit's owner's manual. If these steps are unable to provide an applicable remedy, we would then recommend working directly with an independent authorized service provider in your local area. These trained professionals are able to not only determine the cause of a unit's issues, but can also provide any applicable warranty coverage.

If you would like to speak with us regarding your personal experience, please do not hesitate to contact us directly at 888-GENERAC (436-3722). We apologize for any inconvenience that this experience may have caused, and fully understand your frustration. Moreover, we look forward to working with you, as well as your chosen service provider, to provide you with a unit that functions as intended out of manufacturing.
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