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.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.
IT is in the fuel tank. IT is in the fuel tank.
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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It is in the fuel tank.
INSIDE 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.