93 940 wagon non-turbo

Friend mechanic replaced my fuel pump as we both thought it was the problem to an issue (it was not but it is moot). I have fuel leak coming from where a hose comes to the assembly at the top of the tank. It is the only one with a 90 degree bend. I thought maybe there was a crack in the male nipple from the assembly but it now appears that the leak is coming from where they come together. Like a loose connection. The hose seems to be secured to the body via a zip tie supporting the hose. I am guessing that is not OEM. The previous owner was a Mechanical Engineering prof and he fiddled with some parts of the car (with varying success). Where does this hose go to/come from? There also seems to be some leaking from the hose itself at the 90 bend. It there some kind of over pressurization issue?
I have some kind of vac leak which is much worse about the same time as this problem (the AC output drops markedly on any throttle applied. Related?

Trying to beat the darkness thus I have not read the FAQ yet.