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Chances are its what is called the fuel pressure regulator is the problem.
These other systems have vents and valves and are disgined them selves .
The pressure regulator deals with the fuel injecters mainly back pressure feed back to the tank .
The vehicle will run OK but when you shut it off you smell gas vapor it has to get out .
On 4.0L 6 cylinder engines, a molded vacuum tube connects manifold vacuum to top of cylinder head (valve) cover at dash panel end. The vacuum fitting contains a fixed orifice of a calibrated size. It meters the amount of crankcase vapors drawn out of the engine.
On 2.5L 4 cylinder engines, a fitting on drivers side of cylinder head (valve) cover contains the metered orifice. It is connected to manifold vacuum.
A fresh air supply hose from the air cleaner is connected to front of cylinder head cover on 4.0L engines. It is connected to rear of cover on 2.5L engines.
When the engine is operating, fresh air enters the engine and mixes with crankcase vapors. Manifold vacuum draws the vapor/air mixture through the fixed orifice and into the intake manifold. The vapors are then consumed during combustion.
This was the best I was able to come up with. Now there is the vapor/vacuum for the fuel system as well as vacuum lines for the A/C system but didn't know is you needed thoses as well. Hope these help.
DTC P0440 code indicates that a part of the EVAP
control system is no longer fuctioning correctly. The EVAP system consists
of many parts, including (but not limited to) the gas cap, fuel lines, carbon
canister, purge valve, and other hoses. The (EVAP) emission
control system prevents the escape of fuel vapors from a vehicle's fuel system.
Fuel vapors are routed
to a charcoal canister for storage. Later, when the engine is running a purge
control valve opens allowing intake vacuum to siphon the fuel vapors into
engine. A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Additional details could find in this links Fault Codes
on Cars & Trucks or other diagrams in Cars &
Trucks Vacuum Diagram.
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The vapor line will never be inclosed inside of the automobile. Electrical lines YES. In the rear of your auto you have back up lights, tail lights, turn signal lights, LC plate lights. may truck release switch wire, speaker wires, and the emergency fuel shut of switch. If the vehicle is in a front end/back end accident it will tripe the fuel safety switch. It is a red button located in the trunk panels. GB..stewbison
Hello! The vapor canister is more than likely plugged...The carbon granules can infiltrate the entire fuel system...I would suggest #1...Replace canister...and fuel filter..#2....Relieve fuel pressure, disconnect battery, remove and clean the fuel rail and injectors...On 8/12/1996 there was a recall on your vehicle addressing the fuel and injection system...If the recall was performed there should be a sticker on the inside of the drivers door...The original culprit is the Fuel Vapor control Valve which is allowing fuel to enter the vapor lines...see diagram below...