Not much "back to the DB" about it Arizoni.
ghg's suggestion is one option. The other would be to mill a step into the tip of your tube above the packing to fit.
ghg's would be the simplest, and the simplest is often the best..
Hook it up, flush out any debris, install the tube, seal the faying surfaces with bead of JB weld or a fuel-resistant sealer, and you're good to go.