DIY bench top fuel injector spray pattern checker & cleaning.

How else should I say this? Basically I'm preparing to install reconditioned Denso injectors, all new soft fuel line and filter on my Sequoia and I decided that I want to know exactly how the spray pattern is on all 8 injectors already instaqlled on my truck. I also want to bench teas all 8 reconditioned Denso injectors I'm preparing to install.
I've known of people doing a similar install using all the correct parts yet upon first start up something is wrong and they now have a stumbling idle, or other condition that mysteriously appeared and no idea where to look to fix it. They say that it is common to have around 7 to 10% defective parts when your buying new and reconditioned electronics from lower costing sources. O'rileys, Auto Zone are the kind of places you'll experience these bad parts.
I needed to replace the alternator on a big flagship BMW I owned and decided on using a remanufactured Bosch alternator from Auto Zone instead of spending over $800 from an outlet selling OEM stuff. I spent the $180 for the rebuilt alternator and had it installed within half an hour. Upon first start, the red charging light was still on! Using my multimeter I determined that the new alternator was a dud. Oh well, I'll have to pull it out and do the job again. Certainly, there won't be a second bad alternator on the shelf at Auto Zone.
The next day I repeated the process and finally got back to the BMW and installed the replacement alternator. Upon first start the red charging light was still on.....again!
I decided to get my money back from Auto Zone and start over fresh at O'rileys. But, before setting foot outside of the auto parts store, I insisted we "bench test" the alternator just for my piece of mind. The associate connected the wiring to my new alternator and spun the armature......it produced 14.7 volts! Perfect.
This time after installing the replacement alternator, she fired right up and red charging lamp was not on.
The difference between expensive electronics and medium priced similar looking parts id the time it takes to do Quality control. The more expensive parts are inspected constantly during production where the lesser priced parts recieve occasional or 1:25 pieces inspection. If something goes wrong during production on lesser priced parts, that means there very well could be about 20 defective parts being sold to unsuspecting buyers who will unbeknownst to them spend hours and hours needlessly installing a defective part.
My bench top set up is being put together so that I will not run into unknown problems. It will also give me a better understanding on my part of what the spray pattern actually looks like.
Injectors fire with 12 volts and the way the system in your truck operates is the injectors have constant 12 volts, it is the ground connection that the ECU controlls. Also fuel is pressurized up to around 35 psi and a bit higher.
I plan on using 2 hand fluid pumps available at Harbor Freight to do the pressurizing. They call them vaccum pumps but connecting them in reverse will give you a pressurized line. They also come with a gauge connected on top. I'll mount the injector with a couple of zip ties behind a piece of Lexan clear plastic, connect power to it, and use a relay and a momentary switch to activate the relay. Ill buy some carburetor cleaner and a gallon of gas. I will use a cut-down plastic gallon bottle as a resavour and begin spraying. A dirty injector could have blockage that disrupts spray pattern and hopfully the carb cleaner will restore function. Never pike sharp objects into injector orafises! You'll damage the spray tip.
I will do a follow up posting with photos once i am under way with this project.
Thanks for reading.