How is this happening?

[Peter Jackson]

Fuel is ending up in my emmissions system. There is too much to just be
vapor or blow by.

Symptoms: After spirited driving on hot days -
A constant whistle tone from near filler neck at the tank end. Not from
the fuel pump or the gas cap. It will persist anywhere from 5-25
minutes. Stops when cap released.

Evap cannister is filling with fuel and draining out of the air inlet
tube on the bottom.

Fuel smell while driving, can be initiated almost at will by turning on
the airconditioning.

Symptoms disappear with granny driving except for very faint fuel smell
with AC on.

Attempted fixes:
New gas cap
New fuel check valve
Evap cannister has been checked and works to specs.

According to the FSM:
The evap cannister is only connected to the vapor line from the tank,
outside air, the EGR/evap purge control valves, and the intake manifold.
Two ins and two outs only one involving vapor in.
The fuel routing is from the pump to the injectors to the regulator and
back to the tank.

If liquid fuel is coming through the vapor line, HOW?
The only other sources are the EGR or the intake manifold.
It's a lowport so leaking injectors(possible source of fuel?) wouldn't
pool fuel through the egr or evap manifold connection? It would have to
flow up.

Stumped
Peter J
96 SE-R