Yo Irished,
Welcome!
Is fuel filter clean?
If it's a mechanical pump, the pump arm may not be in resting on on cam lobe. See attached depiction, the arm is to the upper right of tbe pump body.
"Take a look at the fuel lines from the tank to the carb, looking for any holes or collapsed spots..."
by our late friend Randy (Justshootme84).
"Take a good look at the fuel line. Places where it has a bend in the line and is close to the manifold is prime for contacting heat and causing problems. Look under the vehicle, I have seen a hole in the exhaust pipe blowing on the fuel line, and causing the problems you describe. " by Rons Beast
Mechanical Fuel Pump Installation in an 84 Bronco:
"Disconnect the fuel inlet and outlet lines at the fuel pump. Discard the fuel inlet retaining clamp.
Remove the pump retaining bolts then remove the pump assembly and gasket from the engine. Discard the gasket.
If a new pump is to be installed, remove the fuel line connector fitting from the old pump and install it in the new pump.
Remove all gasket material from the mounting pad and pump ******. Apply oil resistant sealer to both sides of a new gasket.
Position the new gasket on the pump ****** and hold the pump in position against the mounting pad. make sure that the rocker arm is riding on the camshaft eccentric.
Press the pump tight against the pad, install the retaining bolts and alternately torque them to 20-24 ft.lb. on the 8-302; 14-20 on the 8-351; 19-27 ft.lb. on the 8-460. Connect the fuel lines. Use a new clamp on the fuel inlet lines.
Operate the engine and check for leaks." by Chilton
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Pressure Check:
"Remove the air cleaner assembly. Disconnect the fuel inlet line of the fuel filter at the carburetor. Use care to prevent fire, due to fuel spillage. Place an absorbent cloth under the connection before removing the line to catch any fuel that might flow out of the line.
Connect a pressure gauge, a restrictor and a flexible hose between the fuel filter and the carburetor.
Position the flexible hose and the restrictor so that the fuel can be discharged into a suitable, graduated container.
Before taking a pressure reading, operate the engine at the specified idle rpm and vent the system into the container by opening the hose restrictor momentarily.
Close the hose restrictor, allow the pressure to stabilize and note the reading. The pressure should be 5 psi.
If the pump pressure is not within 4-6 psi and the fuel lines and filter are in satisfactory condition, the pump is defective and should be replaced.
If the pump pressure is within the proper range, perform the test for fuel volume." by Chilton