[Goat Blower]

It would be easier to send them out. You can do it but you'd have to set up a test rig that would energize the injector and have it hooked up to a high pressure liquid source and run a fuel detergent through it. More work than it's worth, that's why you send them out. Plus you get an actual flow rating before and after from each injector. Nice info to have and it ends up balancing them a bit as well.