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Doing the check rusty's way is the correct way. (never mind we did/do) it. Beware, (Especially on a test rig) Because, YES, a firing injector WILL 'squirt' clear through a hand. Or.. fill it with diesel. On reflection..'there's ways and there's ways. BE SAFE.

Hydraulic pressure in this case 'collapses' immediately when there is a leak. (as) you can not compress oil. (and) over the (many) years we have checked everything and anything.

With the engine running just loosen one injector pipe at a time, and you will immediately know which cylinders are not firing. At that time check if the ones you loosen are in fact squirting, or the fault lies elsewhere.