Since EFI engines run under fuel pressure, there will be pressure in the lines. It does leak down, but the time is dependant on the condition of the system as a whole. There is a bleeder valve usually up on the fuel rail. There should be a schrader valve with a cap. It's similar in size and shape as a tire valve. Simply locate, remove cap, wrap with some type of cloth absorbant, then push on the stem. It should bleed the pressure as well as the fuel near the valve. There is still fuel in the lines, just not under pressure. Gravity will pull the fuel out of the lowest point in the lines.
When I do a fuel filter with an EFI engine, I first bleed pressure, then drain the line from the engine first. I usually can keep the filter higher than the tank in doing so.