I have had such a hard time figuring out my vacuum hose routing and what each thing does I thought I would post what I have so far. I have a 1981 F-100 with a 302 2 BBL. I found about 30 different ways this engine has the hoses routed in the Library. And everything is in Acronyms.
VACUUM DIAGRAM ACRONYMS
A/CL: Located in the air cleaner
A/CL DV: Air Cleaner Diverter Valve
A/CL BI MET: Air Cleaner Bi-Metallic Valve
A/CL CWM: Air Cleaner Cold Weather Modulator
ACV: Air Control Valve
AIR: Ford calls this the Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.
AIR BPV: Air Bypass Valve (aka Thermactor Air Bypass TAB)
BV: Bowl Vent (on top of the float tanks)
CARB: Carburetor
CPRV: Canister Purge Valve
DIST: Distributor
EGR: Exhaust Gas Recirculator
EFCA: Electronic Fuel Control Assymbly
FLTR: Filter
FPR: Fuel Pressure Regulator
IVV: Thermactor Idle Vacuum Valve
MAN VAC: Indicating Manifold vacuum-Vacuum source
MAP: Manifold Absolute Pressure
PVS: Ported Vacuum Switch
SOLV: Solenoid Valve
SV-CBV: Carburetor Fuel Bowl Solenoid Vent Valve
VAC: Vacuum
VCKV: Vacuum Check Valve
VRESER: Vacuum Reservoir
VREST: Vacuum Restrictor
VRV: Vacuum Regulator Valve
V CK V: Vacuum Check Valve
VRDV: Vacuum Retard Delay Valve
TVS: Thermal Vacuum Switch
TVV: Thermal Vent Valve
PURGE CV: Vapor Canister Purge Valve
Color Codes to do Vacuum Diagram
Red = Main vacuum
Green = EGR function
Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex)
Yellow = Distributor advance
White = EGR vacuum (source)
Black = Mainly used for the Evaporative emissions control
Black = Thermactor ACV or Diverter valve
Blue = Throttle Kicker control
Pink = Thermactor Air Bypass Valve (BPV)
So this is what it took me two days to come up with. What a VRV is? What an EFCA is? Still searching. But I have grown to hate acronyms because they can be for many things. Some sound like the same ball park. How would you like to go in and order an LSD (Limited Slip Differential) and get an sugar cube full of drugs? Why it can't be spelled out is beyond me.