Chris;
I like your inverter solvent pintle soak/flush!
...and I think your Injector test method with the see-through tubing is quite brilliant for its simplicity, effectiveness and safety, and I have added it to my D-Jet page (I did request permission to repost, but I don't believe I heard back from you on it...yet!), I must speak out against the electrical insult you are subjecting applying ANY non-current limited voltage to Injectors.
We agree there is a high possibility that Injectors will be damaged by applying 12V...but do not apply ANY voltage over 3V without current limiting!! By applying 12V by way of a 6 Ohm current limiting resistor as in normal operation, thereby the resistor acts to limit the current and it also works as a Dropping Resistor, allowing only about 3V to be applied to the Injector, as well as shaping the inrush current....
See also: https://www.sw-em.com/bosch_d-jetronic_injection.htm#Dynamic_and_Static_Injector_Test_Notes
Cheers
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