easy way is to get 6 small beakers, remove rail from manifold and test the injectors that way - you can fabricate some locking system on the injectors with some mechanics wire etc.

nicer way has been mentioned by 97 SL320

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)