I don’t mean to be argumentative but a better fuel flow test is to open the fuel RETURN line at the QD (quick disconnect), push in the check valve on the fuel distributor side of the open QD, and then see if you get fuel flow in the return line when the key is turned on.
If you measure at the injector, there is no pressure built in the line and you will get copious amounts of fuel even if an in-tank hose is split. By measuring at the RETURN QD you can tell that there’s fuel flow under pressure.
And if you need to, you can measure the return fuel flow at idle, which should be about 2 liters per minute. That will confirm enough fuel flow at wide open throttle.