What components are shown on this vacuum hose routing diagram?

It shows the fuel tank(s), carbon canister (CARBON CAN), V REST, CANP purge solenoid, AIR B and AIR D thermactor valves, MAP sensor, EGR valve, EVR, FPRC, vacuum reservoir (VRESER), throttle body, two manifold vacuum (MAN VAC) fittings, and two SOL V solenoids for AIR D and AIR B.

Where do the AIR D and AIR B valves get their vacuum signals?

Each is controlled by its own solenoid (SOL V) mounted on a common black supply line; the AIR D solenoid feeds the AIR D valve via a yellow hose and the AIR B solenoid feeds the AIR B valve via a pink-striped hose.

How is the carbon canister connected in this diagram?

Dashed lines route from the FUEL TANK(S) through V REST to the CARBON CAN, then to the CANP purge solenoid, with a dashed line continuing to the throttle body.

What controls the EGR valve according to the decal?

The EGR valve is connected via a green-striped hose to the EVR (EGR vacuum regulator) solenoid, which sits on the common black vacuum supply line.

How is the diagram oriented?

The decal is labeled "FRONT OF VEHICLE" at the bottom, so the layout is drawn with the front of the vehicle toward the bottom of the diagram.

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1993 Ford F-150 Emissions Vacuum Hose Routing Diagram - Under-Hood Decal

Ford EFI vacuum hose routing diagram with EGR, EVR, MAP, FPR, canister and dual solenoids

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Vacuum hose routing schematic showing connections among throttle body, MAP, EGR/EVR, FPR, carbon canister/CANP and air-bypass/diverter solenoids; front-of-vehicle orientation.

AI caption April 2012 · Photo 154 of 256

This document is a scanned under-hood emissions decal showing the factory vacuum hose routing diagram, uploaded to the gallery of a 1993 Ford F-150. The schematic depicts the emissions and vacuum control system layout as viewed with the front of the vehicle at the bottom (labeled "FRONT OF VEHICLE"). Components identified include the fuel tank(s), carbon canister (CARBON CAN), vapor restrictor (V REST), canister purge solenoid (CANP), thermactor air bypass (AIR B) and air diverter (AIR D) valves and their solenoids (SOL V), the MAP sensor, EGR valve, EGR vacuum regulator (EVR), fuel pressure regulator control (FPRC), vacuum reservoir (VRESER), throttle body, and two manifold vacuum (MAN VAC) source fittings. Hoses are distinguished by color coding — black, red, yellow, pink-striped, and green-striped lines — with dashed lines indicating vapor/purge connections between the fuel tank, vapor restrictor, carbon canister, purge solenoid, and throttle body. A reader can use this diagram to trace which vacuum port feeds each emissions component and to restore correct hose routing after engine service. The decal carries no visible year, engine displacement, calibration number, or part number, so applicability must be inferred from the vehicle it was photographed on.

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Frequently asked questions

What components are shown on this vacuum hose routing diagram?: It shows the fuel tank(s), carbon canister (CARBON CAN), V REST, CANP purge solenoid, AIR B and AIR D thermactor valves, MAP sensor, EGR valve, EVR, FPRC, vacuum reservoir (VRESER), throttle body, two manifold vacuum (MAN VAC) fittings, and two SOL V solenoids for AIR D and AIR B.
Where do the AIR D and AIR B valves get their vacuum signals?: Each is controlled by its own solenoid (SOL V) mounted on a common black supply line; the AIR D solenoid feeds the AIR D valve via a yellow hose and the AIR B solenoid feeds the AIR B valve via a pink-striped hose.
How is the carbon canister connected in this diagram?: Dashed lines route from the FUEL TANK(S) through V REST to the CARBON CAN, then to the CANP purge solenoid, with a dashed line continuing to the throttle body.
What controls the EGR valve according to the decal?: The EGR valve is connected via a green-striped hose to the EVR (EGR vacuum regulator) solenoid, which sits on the common black vacuum supply line.
How is the diagram oriented?: The decal is labeled "FRONT OF VEHICLE" at the bottom, so the layout is drawn with the front of the vehicle toward the bottom of the diagram.