6- My Honda GX390 4 GPM 4000 PSI (Shaft Driven Pressure Washer) from an 80 Gallon Buffer Tank 

Dude you're the man. Thank you for all this info 🙏

I did a similar process with my 4 gpm machine. I decided to go ahead and replace the unloader and intake completely. if you take the bolt out from the unloader, you’ll see that it has a tiny pinhole that restricts float. If you change unload, you’ll get a lot more flow. I’m running the exact same pump and getting about 5 gpm with 3000 psi at the tip. They have a kit on Amazon. I believe it’s like 35 to 50 bucks.

Really been thinking about starting my own pressure washing company. Your videos really help inspire me. Keep up the good work 👍

Great content, I also subscribed!

great video! hoping to see more video's new subscriber

It was a good video. I think I have the same exact pressure washer pump. I got off of Amazon it just rebranded by another company named VEVOR. I was trying to figure out a way to allow the water to flow through my unloader valve when I release the trigger from my gun. The problem was I couldn't figure out a way to make it work with the existing set up of the pump itself. It also is the 4 GPM 4000 PSI WITH THE 1 INCH SHAFT, SO I ALSO MATCHED IT UP WITH HONDA 390 GX AS WELL WHICH PUTS IT OUT ABOUT THE 13 HP RATING NEEDED IN ORDER TO SPEND THAT PUMP PROPERLY TO MAXIMIZE WATER FLOW AND VOLUME. I think I'm gonna try to set mine up like you did yours except I might make my discharge hose a little bit longer In a coil configuration in order to maximize the amount of cold water that go through mine, but I have to feed mine back into the PRESSURE WASHER somehow because at this point it's just for personal use. Yours works just fine because you're feeding the water right back into your buffer tank so there's no real pressure being built up. You mentioned about your Honda engine was previously Having the RPM surging up and down similar to what's called Governor Hunting in order for the RPMs to level off. It won't actually hurt your pump or anything but yes you are correct thats it's darn annoying that's for sure! Wow your fuel filter could've been a contributing factor to the surging up and down of your engine? The main culprit Contributing factor Causing the unstable idle speed or poor performance at low speed was due to the pilot jet being clogged, pilot screw being clogged or most common is the pilot jet path is clogged. This is mainly due to the ethanol that's been added to our gasoline, which tends to not be troublesome for automobiles whatsoever, but can wreak havoc on carburetters that were never made or intended for use of corn based alcohol, which will clog the pilot jet of any carburetter once the gasoline evaporates, leaving behind the corn syrup which is alcohol. Alcohol being hydroscopic or water loving, pulls the water or moisture from the atmosphere, causing the carburetter to rust from the inside out and blocking any passageways while doing so such as the pilot jet screw which metres airflow. This is the reason why when you put on a new carburetter that the problem was solved, not so much to do with the fuel filter. a product I use is called ethanol shield. This product doesn't get rid of the ethanol, but rather shields the vital pieces of the carburetter from the ethanol by conditioning and coding the O-rings and gaskets etc. within the carburetter to keep it from getting petrified from the petroleum, a.k.a. gasoline With ethanol in it. I've heard, but not confirmed that ESSO 90 MIDGRADE AND SHELL 91 octane rating does not have ethanol in those two blends. be safe just air on the side of caution and buy a small bottle of ethanol shield from Home Depot that treats about 80 gallons from a small nine dollar bottle of ethanol shield. The only other way to filter out The ethanol is by adding some water and food colouring and shaking up the gasoline then letting it sit to settle in the water will go to the bottom along with the ethanol. Adding a small amount of food colouring will show the separation line between the gasoline and the ethanol and then he just syphon it out slowly or just forget all that and buy a bottle of ethanol shield from Home Depot lol. Other than that you're set up looks great and I can't see any problems with it whatsoever. a small modification or recommendation would be if you were able to put in RV filter from your buffer tank to your pressure washer in order to filter out as much of Unwanted contaminants in hard water to minimize residue, left over on windows, siding, cars etc. By removing some of the water hardness will definitely benefit your pressure washer pump & increases lifespan. Another good practice would be every every once in a while to run that pump saver product through the pump and let it sit overnight or the weekend to rejuvenate the O-rings, seals & gaskets within the pump to maintain pump performance. If you do find a lot of water hardness white spots around your pressure, washer pump set up then you could try running some CLR through the pump just a few shots in the intake where the garden hose goes into and then hand crank it slowly to allow the CLR to go through basically the same as the pump saver pull the cord slowly without starting the motor. This will allow the product to sit within the pump, giving adequate time to do its job. I also immediately drained the pressure washer pump after about an hour of usage in order to get rid of any of the break-in Metal shavings or contaminants that might be found in the pump oil. Once it was drained, I filled it up with synthetic pump oil 75w90 in order to increase the lifespan of the pressure washer pump. Keep up the great work. I look forward to seeing update videos of your progress in the near future with regards to your pressure washing rig.

Buffer tank needs to be higher than the inlet on your pressure washer to run safely as gravity feed option.

Thanks! Your video is the first I've seen where somebody takes the time to explain how they plumbed up a 4 gpm direct drive to a buffer tank! Could you post where you got the 1" hose barb x 1/2" male npt going into your pump? I want to give this a shot. Really helpful, really! Thanks so much! You just got a new sub! 👍

Your pump shouldn’t have that red oil non vented plug on it, it should be a yellow vented plug. Probably why your hose is retracting. You’re going to blow that pump if you don’t change it asap.