start at 1 1/2 turns out from seated in and adjust for highest manifold vacuum at idle
if it is a rochester carburetor, it is inside the carburetor just behind where the fuel line screws into it.
IT is in the fuel tank. IT is in the fuel tank.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.
they are fuel injected.
If that truck has a carb it's probably inside. Take off the fuel line and remove the nut that the fuel line screws into. Pay attention to which way the filter goes. There is usually a hole in one end and a spring behind it.
remove the bed of the truck.....
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INSIDE THE FUEL TANK.
It is in the fuel tank.
It controls / regulates the fuel pressure.
its in the fuel tank, built in as part of the fuel pump.
It is inside of the fuel tank. It is a electric fuel pump.