Fuel draining out of Racor

[Bob Lawrence]

Hi group,
We are finally on the road fulltime and have just left Death Valley.
The bird wouldn't start and I noticed the clear bowl on the Racor only
had 3-4 inches of fuel in it.
Upon removing the filter to see if clogged, I could here fuel,
glug,gluging into the bowl. It didn't add an inch before not gluging
any more.
I blew thru the filter and fuel came out top to bottom of filter which
told me filter wasn't plugged.
Put filter back in, added ATF to fill the filter and it started right
up.
Fuel is draining back to tank.
Is the fuel pump going bad? Only thing I can think of.
What say you?

Bob Lawrence
84 PT36
Presently in Laughlin, Nv