72 Mach 1 leaking gas

I bought a beat up 72 Mach 1 a couple weeks ago (my first project car)
and probably bit off more than I can chew. I filled it up with gas
yesterday, and this morning noticed it dripping gas from where the gas
line comes out of the gas tank. Looks like there's an elbow coming out
of the gas tank, and a hose connected to that. Not sure if the leak is
from where the elbow meets the tank, or where the gas link connects to
the elbow. Is there a way to quick-patch this, or should I even try? I
didn't get a chance to see under the whole car, but if I try to
replace that gas line, how long does that piece go (all the way to the
front, or is there a gas filter in the back)?

Thanks,
Neil