In my line of work we use compression fittings for air lines and hose connections. I've installed these on my fuel line connections to the filter bodies with good results. The nice thing is they are reusable without new parts.(washers etc)
I'm not certain this would be totally 'kosher' with ABYC stds, but in industry we use them up to literally hundreds of pounds pressure so I'd expect they are fine for this service (i.e. supply to the injector pump).
Here's an example.. they can be had in SS or Brass and in barbed hose versions too.
Parker - SINGLE FERRULE COMPRESSION FITTINGS