If it starts and runs for a few seconds it is probably a fuel delivery problem as opposed to a bleed problem. If it needed bleeding it would not run at all.

Can you observe the fuel in the prefilter while the engine tries to run? Once you get it so that the fuel stays mostly full in the prefilter and it won't start, you then pump the primer pump until you hear hissing at the top of the main filter. THEN, with a fully charged battery, crack all the injector lines at the injectors. Have someone turn the engine over until you see fuel dribbling out of one or more injector lines. Tighten whatever line you see it dribbling from and then have them crank it some more. Once you have had fuel dribbling from all injector lines and then have them tight, it should be bled and continue to run.