Ford 1997 Aerostar Workshop Manual page 5

1997 Aerostar/Ranger
Section 10-01: Fuel Tank, Filters, Lines and
Electric Fuel Pump
DESCRIPTION AND OPERATION
Fuel Vapor Valve, Aerostar
All fuel tank evaporative emission valves (9B593) make use of a small orifice that tends to allow only vapor
and not liquid fuel to pass into the line running forward to the evaporative emissions canister (EVAP
canister) (9D653). This evaporative emission valve mounts directly into the fuel tank (9002) using a rubber
grommet. This evaporative emission valve is used for Aerostar 3.0L engines. For 4.0L engines, a differential
evaporative emission valve is used.
Fuel vapors contained in the sealed fuel tank are vented through the orificed fuel tank evaporative emission
valve in the top of the fuel tank. The vapors leave the evaporative emission valve through a single vapor line
and continue to the evaporative emissions canister in the engine compartment for storage, until such time as
they are purged to the engine (6007).
In the event of extreme conditions (excessive fuel tank pressure) the purge port of the evaporative emission
valve opens up, allowing fuel vapor to vent the atmosphere. This purging action stabilizes pressure in the
fuel tank.
Fuel Vapor Valve, Aerostar
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKA1005.HTM~gen~ref.HTM
1997 Aerostar, Ranger, Equipped with 2.3L, 3.0L, and 4.0L
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Gasoline Engines Workshop Manual
Page 1 of 2
2011-04-29