Low fuel pressure

I have the car listed above. At first it would crank but would only run for a few seconds on starter fluid straight to the carburetor. I replaced the mechanical fuel pump and the filter along with the rubber hoses but the same thing happened. After troubleshooting by cranking the ignition and seeing if fuel was getting pumped from the tank, I could see that fuel was getting through and out the filter but would not get through the metal line that goes to the carburetor. I blew air through the metal line and the air was passing fine but when cranking the ignition only a couple drops of fuel where getting through. The only thing I can think of is not enough fuel pressure but I have no idea how to fix this. Need help, thanks.