The length of the soft line is not important... the barb which its installed on, on the metering pumps, rotates. This rotation is what allows fuel to be pumped upwards. If they are not both fueling at the same amount, it can cause running issues. In actuallity its not the barb that rotates, but the lower pin that goes into the fuel rack (you just need to set it properly so the fixed barb appears to be rotated fully open, as close to the pushrod tube as possible)/
Another SS user put this video together about the metering pumps, may shed some light on the assembly: