To find the correct fuel pressure for your specific 1972 Ford, you need to:
1. Identify your engine: Look for an engine code (often stamped on the engine block) or consult your vehicle's owner's manual. Knowing the engine size (e.g., 240 cubic inch inline-six, 351 cubic inch V8) is crucial.
2. Determine the carburetor type: The carburetor's specifications will usually dictate the fuel pressure. The carburetor might be identified by a number stamped on it.
3. Consult a repair manual: A Haynes or Chilton repair manual for your specific 1972 Ford model and engine will provide the correct fuel pressure specification. These manuals are invaluable for this type of information.
Without knowing the specific engine and carburetor, it's impossible to provide the correct fuel pressure. Trying to guess could damage your fuel system.