Couple of things to note when replacing fuel lines (saves getting petrol everywhere, from bitter experience
). Before removing any hoses in the engine bay, depressurise the fuel system first. Even if the car hasn’t been started for a while. Safest way is to disconnect the cold start injector harness and put 12v across the injector. That will discharge residual fuel into the inlet. Also, and this isn’t in the manual, undo the fuel filler cap to release any pressure in the tank. This is important if you’ve run the car recently and want to remove the fuel return pipe. Damn stuff just keeps coming out the pipe until the pressures released otherwise.
Attached is an extract from the service manual, it’s got a section on fuel hoses and the correct lengths when reconnecting them. Worth a look but mostly common sense.