83.5 wbx,

New ignition system, (yes I have spark), fires when I inject fuel
into intake plenum. Does not fire otherwise. I have replaced the fuel
filter, fuel pressure regulator (had a spare so why not), cleaned the
injectors, checked the injector clips with a noid (yes good pulses on
all four)  and I'm thinking that the pump is defective in it's
pressure output. ( As in not enough pressure to squirt fuel under
compression) The pump runs for 3 seconds when the ignition is turned
on but with either an injector bar hose disconnected or the pressure
release bolt removed  I get no squirting fuel back at the engine .

Should this "open system" squirt fuel out of either or both of these
openings?

Is my thinking logical?  How  (sequence) should I check the fuel pump
function. ( I don't have a pressure gauge though could acquire one if
necessary.
   TIA
  Don ( the frustrated one)