i've recently had these issues. heres what i had wrong.
Fuel bowl/heater/water fuel seperator had a pinhole in it, pitted from inside-out.
Drain valve on water fuel seperator was leaking from bad o-rings, ford sells the whole valve for 47$ rather than buying the o-ring kit for 35$.
O-rings on fuel line fittings leaking, replaced the fittings themselves because they have screens and check valves which can clogg, so i figured why not while im at it.
All good answers from everyone, im sure someone covered it here. just gotta clean everything up and look around