I`d be leery to run a pressure washer off a connection to a sink. I`ve got the lil 1600psi/1.2 GPM Ryobi and it`s been a great pressure washer. I have noticed that it can be picky about the water supply - if it doesn`t get just the right feed I`ve had it where it will go into fits where it seems like it`s cavitating itself as though it hadn`t been bled out (but it had been). Only happens on one of my hose outlets from the house (and at my Wife`s folks place when I tried to loan it to her dad... *facepalm*).
In your shoes, I`d be researching cordless units that could feed out of a bucket. Look at a foaming pre-wash (I like the Griot`s Foaming Surface Wash, there are other options) you apply via a pump up foamer, then rinse with the cordless pressure washer to drop the grit off. Then proceed with a rinseless wash. (This is assuming the car is getting so dirty you couldn`t just go straight to a rinseless wash).
If you go conventional pressure washer, I guess it all depends on your budget on how you accessorize. I personally haven`t had all that much hate for the stock gun and hose on the Ryobi. Sure, eventually I`d love to upgrade to a shorter gun, but it`s not like you can`t use it how it comes. I use the Griot`s BOSS cannon with the 1.1mm orifice and have no issues getting good foam.
I did get the Ryobi 35ft extension hose that I now use as the primary hose. That way (as mentioned) you can get all the way around the car without dragging the machine around. I find it works best to lay the hose out straight before you start, but once you get that done it`s fine.
Regarding your hose/fitting questions - Most electric pressure washers use M22 (Outer diameter)/M14 or M15(inner diameter) thread together fittings. Threaded on the outside, then the inner bore is smooth on the female side, male side has an o-ring that seals inside the female side). I think SunJoe is the M15, Ryobi is M14. You need to match that measurement to your machine when you get quick connects to save yourself having the thread the hose on each time. Again, perfect world I`d upgrade and use them, but it adds mere moments to setup/teardown for a hobbyist.
Somewhere on here is a megathread with a bunch of pressure washer info that covers accessorizing your basic electric pressure washer - EDIT, it`s here:
https://www.autopia.org/forums/every...ressure+washer . I believe it covers the differences between orifice sizes and hose size (1/4 vs 3/8).
Otherwise, I`ll second other`s thoughts that given your situation I`d probably look at using that pressure washer money for other detailing supplies. I`d have a really solid LSP in place and perfect your rinseless game. Coatings=crack and others have had really good experiences with AMMO Frothe for a safe (pump) spray on foaming rinseless (or was that one waterless?) wash if you skip the pressure washer.
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