1976 280z fuel tank

[cesar280z]

I'm trying to put the fram filter between the fuel tank and the pump, however the hose that goes to the pump it is not a 3/8 as everybody is saying it seems to be a 1/2 , attached is a picture of the fuel tank nipple, I do not know if the owner before me tried to "reinvent" the way the fuel flow goes ,due to the fact that he replace the OEM fuel pump and removed the damper ,any thoughts?