Nikki twin choke not squirting?

[Veemax]

Just cleaned a Nikki carb i got for the cortina to play with for time being, filled the carb with fuel on the bench to test float level an check for leaks as not been used for yrs, anyway tried the throttle lever action an noticed there is no squirt down the venturi from the accelerator pump like the webers an zenith carbs do, the pump valve is going up an down ok an nothing on the carb seems worn out or perished?, or am i wrong that the carb needs vacume or draw down the throat with engine running to cycle the accelerator pump circuit?

or is it strip down again an see if the pump valve has something missing or broke?