51 PSI @ Idle
Nissan 280z's and zx's had external fuel pumps around that psi, and Ford's from the 1980's had external fuel pumps (but it had a higher psi).
Fuel pump pressure depends on which fuel system the car has. If your car has a carburetor then the fuel pressure should be 9 - 13 psi. If your car is fuel injected then the fuel pressure should be about 45 psi.
43 psi
40 psi
41 to 47 psi
60 to 66 psi, engine off, fuel pump running.
fuel pump maximum output pressure is 64-85 psi however the actual operating spec with fuel pressure regulator vacuum disconnected is 34-40 psi.
3 psi
15 psi
You will need a fuel pressure guage to check the fuel pump. The pump operates at 13 psi.
Fuel pump pressure (Maximum) 75 psi