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EN-51614 allows the DPF Injector to be Tested Outside of the exhaust System.?Once the DPF Injector is removed from the exhaust, it is re-attached to the Fuel Line upSide down, and the Block-off Plate of EN-51614 is Installed on the exhaust Manifold to prevent exhaust Leaks.?The Test Fixture Block is Installed to the Injector Bracket to Retain the Injector, and a Hose is Installed over the Injector Nozzle to direct the Fuel Released into one of the Test Tubes from J-45873 Fuel return volume Test kit.?The Engine is then started, and the Injector triggered for a specific amount of time.?The Fuel injected during this time is measured to deTermine if the Injector is operating properly.