Low Fuel Pressure - electric fuel pump

Found the information on the fuel pump. It's a Facet PN 40104. It appears this pump only outputs 1.5 to 4.0 psi. Since we have 1.5 psi at the fuel pressure guage next to the carb, the other 3 psi is probably getting dumped back to the tank via the bypass port.

Does the engine need more than 1.5 psi of fuel? If so, I guess I'll be replacing the fuel pump.

Thoughts????