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Get a fuel pressure gauge, plumb it in after the fuel filter. Prime the system and get pressure. Pinch off the return hose and watch the pressure. If it bleeds off, your injectors/orings could be leaking.
To test this, prime the system again, pinch the return line and the send line to isolate the fuel pressure gauge in a closed loop with the injectors. If you bleed off fuel pressure your leak is either an injector, or more likely an oring. If the pressure does not bleed off then you know those items are good and you need to look at the fuel pump. Again, put the fuel pressure gauge after the fuel filter. Prime the system, pinch the fuel line before the injectors but after the gauge. If you leak down, then that means it's either leaking on the ground, it's leaking in the tank, or it's leaking back through the pump itself.
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