I recall that connection as being a PITA, but perhaps no worse than several others on this car.
Why fuel line? Isn’t silicone more heat resistant?
You might note that some have had problems with poor throttle response that turned out to be liquid in that vacuum line. Nobody even knew what liquid it was; could be fuel pooling in there, could be condensation, could be heavier components of gasoline collecting. Whatever, they’d disconnect the line at the ECU and blow through it with compressed air, pushing whatever’s in the line back up into the intake manifold, and the car would run better.
To reduce the tendency for such liquids to get in there, I have proposed removing the balance pipe and flipping it over. This would put that vacuum tap pointing up rather than down. Then the vacuum line would have to make a loop to go back down. I dunno if anyone has actually tried it and I don’t know if it would really prevent the problem, but obviously one would need to ensure that the hose doesn’t kink.