4GPM Electric Start Pressure Washer Build for Under $600

In this detailed YouTube video, we guide you through the step-by-step process of building a powerful 4GPM electric start pressure washer for under $600. Whether you're a DIY enthusiast or a small business owner, this video offers a comprehensive breakdown of materials, tools, and assembly techniques to create a high-performance pressure washer on a budget. Learn how to efficiently source components, assemble the unit, and optimize it for top-notch performance. Watch now to save money and build a robust, reliable pressure washer that meets your cleaning needs!

All links listed below for parts needed

Homemade 4.2 gpm pressure washer Bilt Hard 15 HP (420cc) electric start gas engine 

Home made 4.2 gpm pressure washer 4.2 GPM pump

Home made 4.2 gpm pressure washer Engine mount plate

Homemade 4.2 gpm pressure washer Battery for electric start 15hp Engine 

Home made 4.2 gpm pressure washer battery cables)for starter to battery)

Anti-seize

blue loctite

Bolts from Home Depot
(4) SS 3/8 1/2 inch long carriage bolts
(5) SS 3/8 Nuts
(4) washers (4) lock washers

male to male garden hose adapter

OTHER ITEMS I USE FOR MY BUSINESS

Follow this Link For Video "Pressure Washing Business Equipment Complete Start up Guide .
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HOSES & REELS
100 feet 3/8 hose (non marking)

100 feet Flexzilla 5/8 Garden Hose

3 foot 5/8 hose whip line for garden reel

4 foot whip line for high pressure reel

Hose reel 250 feet Coxreel 4000psi

Hose reel 150 feet 3/8 4000psi

Hose reel garden 5/8

male to male garden hose adapter
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General Pump chemical downstream injector 3-5gpm

Quick Connects for 3/8 pressure hose (comes with 2 males & 2 females) we use these a lot. It's good to keep a few extras

Quick Connect fittings pack of 8 assorted stainless steel

1/4 clear hose for downstream injector. Hose goes to SH(chlorine) or any chemical you wish

Turbo nozzle

JROD 4GPM

Ball Valve 3/8 with quick connects

Short gun with stainless steel quick connects

Long pressure washing gun with 5 basic tips/nozzles

M5 twist(ds twist) my favorite nozzle I use 95% of the time

Pressure gauge

24' Telescope Extension Pole

brush
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BE Surface Cleaner w/casters

18 inch Surface Cleaner w/casters

Surface cleaner tips 25° 4gpm (there are two 2.0 tips= 4gpm
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External unloader valve (pressure washer upgrade to allow machine to dump water back to buffer tank to keep pump cool at all times when you let off trigger) Saves your pressure washer pump from overheating!

3/8 male quick connects for external unloader valve

I do get a very small commission for each item. Thank you for your support of this channel!

key words:
#pressurewashing
#cleaningmotivation
#pressurewashingbusiness
#family
harbor freight predator pressure 4gpm washer 4400 psi 4.2 gpm
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aaa pump
cat pump

[Jason-eoxo]

This video saved me! My Simpson 2.4 went out and I am now looking at putting together an upgraded setup. Much appreciated!

[kurtisbiggins]

The new build is a beast. Tested on my house. Upgrading from a 2.5 gpm to 4.5 gpm is a big difference. I ordered a cart for the pressure washer tho because I need to move it around. It's very heavy with the engine, pump and fuel

[kurtisbiggins]

I just finished the build last night. I will be testing it tomorrow. Wish me luck.

[jd-iton]

Any updates? Pump still working good? Always wondered about those cheap pumps

[ACDC]

I wish I would have seen this sooner. I already bought a pressure washer from home depot but dang I wish I had this. I want electric start. Cool build

[patrickpk]

@14:10 you are actually supposed to full the oil up to the top of the treads in the engine, you don't even need the dipstick part. in fact some ppl cut it off as it can break off and ruin the engine and its not needed.

[bigdanish]

If I get one of the cheaper 420cc off Amazon $300-$400 will the shaft fit any pump rated for 4.0-4.5gpm?

[CCP]

Very cool I was hesitant that it would put out 4 gallons but it did and did some. Very cool my black brotha

[RaulMedina-bd]

You're the man.. I wanted a low-profile setup so I can have it in my bed. I do have a question though. Being you have the option for a key start or pull start. When using the key start how does one keep the battery charged? Is there some type of alternator?

I owe you a beer sir :)

[jamespeterson]

I’m interested in building this pressure washer rig. When I follow your link for the engine from Amazon it links to a 79cc 2hp unit. Can you provide additional info so I can find it?
Thanks

[painterhire]

Very Nice ! Thank You Sir 🙏

Actually, I do have a question, Does it need a bypass hose or something ? Like to let it run when not on the trigger.

Thank You Again Sir

[riversidepressurewashing]

quick question if you dont mind me asking. what did you use for leads when first started?

[johnratliff]

Question I did not see addressed in your video. Is the drive shaft a standard with all pumps? Including the mounting holes, size and location?

[hiepha-cp]

gpm pressure washer Bilt Hard 15 HP (420cc) electric start gas engine 
Is not in stock anymore so what other engine do you recommend?

[bryanbahling]

Is there an inexpensive 2 wheeled frame cart you might be able to recommend for this build?

[CarlosHernandez-nten]

I built mine using a predator 420cc, I used it for the first time last night for a gas station job and noticed my oil stick was in place but looked like it had leaked oil. Any idea as to why that happened? Also I’m worried it’ll over heat

[joelpro-touch]

I bought everything in the Description through amazon except the engine. Amazon was out so I bought directly from bilthard. The engine was supposed to be here Saturday. Now I'm getting the run around with no answers. You had mentioned a predator engine do you still have a link for that? Thanks

[CCP]

How much did you pay for the engine? I clicked the link in the description and it takes me to a 79cc and there is no 420cc. I found the same engine for 350 is that what you paid? Thanks