Cummins Injector Manifold Return Vegetable OIl

The banjo bolt returning fuel to your stock diesel filter from the injectors is 8mm x 1.25 thread pitch.

*Or replace with this fitting on the right. I will be posting the part number from AHS soon*

If you go with the bolt make sure it does not cut off the fuel supply hole in the stock banjo bolt

Then purchase this tap 8mm x 1.25


Then this 1/4" NPT (National Pipe Thread) Plug and Tee



Drill through the plug with a 17/64" bit and tap.

Now take the banjo bolt / fitting you removed from the filter and install.

I searched high and low for an answer to the plug but the answer is the plug.


Here are some pics of drilling and tapping the bolt. Remember when tapping to cut for half a turn or so and back out a quarter turn then repeat. Your tapping that brass so it's easy.


Bored out