I have an OM606 NA out of a 96 E300. I am in the process of acquiring all of the fittings and supplies i need to make a pop tester in order to bench test the injectors using a bottle jack. The only fitting I can't find because I do not know what it is called needs to go into a 1/4" female NPT on one side, and on the other end one of the injector lines off the car need to screw onto it. I would really appreciate if someone could help me find the fitting I need.

The first post on this thread should have the parts list you need.
Electronic Pop Tester Cheap

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

I am not sure what info was posted in the other post. However, you can obtain the injector end of the fuel injection Hard line with the nut that comes with it and cut it to the length you want and insert the cut end (rough up the exterior of the tube and smear JB Weld on it) into a brass fitting that has the external 1/4"npt threads.

You may need to drill out the inside diameter of the fitting so the cut end of the fuel injection hard line will fit.


Or the above could be done and the fuel injection hard line silver soldered while it is inside of the fitting instead of the JB Weld epoxy.

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84 300D, 82 Volvo 244Gl Diesel

Thank you for your help, I had found and reviewed them posts thoroughly prior to my post. I see in the one link the guy had the same issue as me and machined his own adapter fitting. I would like to not go the epoxy/JBweld route, my next question is could I take a delivery valve from a spare pump I have and adapt the male end that goes into the injection pump that has an o-ring on it to my female 1/4" npt? I am unaware on the delivery valves size/pitch and whether or not it is straight or pipe thread at the moment. I assumed it was straight thread since there is an o-ring on it. Any help answering these questions is much appreciated!