Tom,

 

I would replace the Aircraft Spruce fitting with one that has the same thread, but an AN4 flare fitting. Keep the parts count to a minimum.  I have a couple local sources of fittings, both aluminum and steel.  If you live in a decent size town, you should be able to find the fitting locally.

 

Mike Easley

Colorado Springs

 

PS  Or you could do the opposite, replace the fitting on the injector body, depending on what size hose is required, maybe you already have the hose.