4 p.s.i.
3 psi
50 psi
Fuel pump running, engine off, 60 to 66 psi.
Pump running, engine off, 41 to 47 psi.
2.2L engine, 41 to 47 psi. 4.3L engine, 60 to 66 psi. This is with the fuel pump running, engine off.
NO you dont need one .. the edelbrock 600 takes 5-7psi
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.