Chemical Injection Problem

JRHernandez88

New member
Equipment:

NorthStar 3.5GPM 4000 PSI pressure washer - http://www.northerntool.com/shop/tools/product_200594833_200594833

Heater add-on unit - http://www.northerntool.com/shop/tools/product_200377863_200377863

With the 50ft hose the chemical is getting picked up but when I try it with a 100ft. hose it stops picking up. Is this a known problem with these small pressure washers? Is there anything I can do to get it to draw chemical with the longer hose? It make it very inconvenient to spray houses down with chemical when I can only go 50 ft., I am having to move the pressure washer many time to get the house fully soaked.

Also I am having problems getting the chemical to draw when attached to the hotbox even with the 50ft hose. Any tips on this?

Any help or tips would be appreciated thanks in advance.
 

Russ Johnson

Equipment Expert
You need an injector equipped with quick couplers to install on the outlet of whatever you're using...the outlet of the machine for cold or the hot box for, of course, hot.
 

JRHernandez88

New member
You need an injector equipped with quick couplers to install on the outlet of whatever you're using...the outlet of the machine for cold or the hot box for, of course, hot.

I'm not sure i understand. I am using the chemical injector that came with the pressure washer & when trying to use with the hotbox i add a chemical injector quick coupler. When I try to get chemical out of the hotbox it doesnt even work with a 50 ft. hose.

Check the gpm of your gun. It needs to be as high as possible.

So the more GPM on your gun, the better the draw? I currently have a 4000PSI 8GPM Gun but will try another gun I have that is 5000PSI 10.5GPM.

Thanks for the quick responces and tips.
 

JRHernandez88

New member

Christopher

Moderator
I have tried 3 of the biggest Northern Tool guns and they would not let me pull chemicals.

Where exactly do you have the injector? Explain the setup exactly. Maybe something simple or maybe it is the gun.

I would look inside the injector and make sure there is no trash in the inside where water flows through and then check and make sure the ball is not stuck inside the little hose barb where the chemical hose connects, sometimes they get stuck.

Always have a spare injector as they do go bad right when you don't want them to.
 

Guy Blackmon

Roundtable Host 2009
Also if you're using a hose reel mount the injector at the hose reel or as close as possible to the hose reel. You're getting just enough back pressure using 100' of hose to shut the down streamer down. Make sure down streamer is mounted after the hot box.
 

Pat Norman

New member
I'm surprised no one has mentioned you may need an injector with a smaller orifice. What size orifice you running? It will be stamped on the injector like 2.1 mm or something.

Pat Norman 663-316-7685
 

Russ Johnson

Equipment Expert
The injector is built into the unloader and is made to pull through 35' of hose.
 

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Christopher

Moderator
Russ, couldn't you just remove the unloader and put fittings there for a plug so he can put a coupler on the injector so he could connect the injector when wanted, when not used, have the coupler on the hose and connect the hose to the plug?

Unless I am reading the diagram wrong, it looks like the injector threads into the unloader so unless the threads are metric, maybe this could work?

What about removing the unloader from the pump and installing a different unloader in a different location so you can use whatever injector you wanted, unless those fittings that go through the unloader and into the pump have special threads?

Maybe remove that unloader and run your water line to the bottom of the pump and your jumper from the top fitting of the pump to the unloader unless those are special fittings and special threads?
 

JRHernandez88

New member
I'm surprised no one has mentioned you may need an injector with a smaller orifice. What size orifice you running? It will be stamped on the injector like 2.1 mm or something.

Pat Norman 663-316-7685

So the injector size is a 2.1mm and is designed to work with 35 feet of hose. So the smaller the orifice the better? What size would you recommend for it to work with a 100ft. hose?

The injector is built into the unloader and is made to pull through 35' of hose.

I would remove the orifice from #469 to disable it and put an add on injector on it.

So Russ, your saying I should plug up the old chemical injector and add a new one? Or would I replace 469 all together? I'm going to start looking into this immediately. Thanks guys!
 

JRHernandez88

New member
Russ, couldn't you just remove the unloader and put fittings there for a plug so he can put a coupler on the injector so he could connect the injector when wanted, when not used, have the coupler on the hose and connect the hose to the plug?

Unless I am reading the diagram wrong, it looks like the injector threads into the unloader so unless the threads are metric, maybe this could work?

What about removing the unloader from the pump and installing a different unloader in a different location so you can use whatever injector you wanted, unless those fittings that go through the unloader and into the pump have special threads?

Maybe remove that unloader and run your water line to the bottom of the pump and your jumper from the top fitting of the pump to the unloader unless those are special fittings and special threads?

Ok, I see what your saying. This might be a good idea... So get rid of 469 all together and install the plug straight into the unloader that way i can add a quick connect chemical injector when i needed it right? Is 443-446 all part of the chemical injector?

I will wait on some feedback before I go out to the store and see exactly what it is I want to do.
 

Guy Blackmon

Roundtable Host 2009
You'll want to put your injector in-line after your hot box, you really don't want chems. going through your coil.......just saying.
 

Pat Norman

New member
I'm not to fond of the adjustable injectors but it should work. I would eliminate the old injector and place the new injector downstream (past) your hot box. Not only do you not want Chems in your coil, but you don't want the added resistance past your injector.

Pat Norman 663-316-7685
 

JRHernandez88

New member
Thanks Pat, I don't like the adjustable either but I cant find anything else. Where else can i find these parts other then northern tool? Would I eliminate from 443 - 469 on the diagram all together?
 
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