CHAPTER 25 EVAP EMISSION CONTROL SYSTEMS
PRIOR TO 1995 THE NON-ENHANCED DG SYSTEM COULD NOT
CHECK FOR LEAKS
DEFINE VAPOR PURGING
DRAWS VAPOR OUT OF CHARCOAL CANISTER
WHERE IS THE PRESSURE RELEASE VALVE LOCATED IN THE EVAP SYSTEM
FUEL FILLER CAP
WHERE IS THE VACCUM RELEASE VALVE LOACTED IN THE EVAP SYSTM
FUEL FILLER CAP
WHAT CAN HAPPEN IF THE PRESSURE OF VACCUM RELEASE VALVE DID NOT RELEASE
FUEL TANK DAMAGE BY FUEL EXPANSION OR CONTRACTION
WHAT CAN HAPPEN IF YOU FILL UP THE FUEL TANK TOO MUCH
GAS CAN BE DRAWN TO THE CANISTER AND CAN CAUSE AN OVERLY RCH MIXUTURE
WHAT SCALE IS FUEL TANK VAPOR MEASURED IN
INCHES OF WATER
PRIOR TO 1970 WHERE DID THE FUEL TANK VAPORS GO
INTO THE ATMOSPHERE
WHY IS CHARCOAL SUCH A GREAT FILTER
IT HAS A LOT OF SURFACE AREA
THE VENT VALVE IS LOCATED IN THE ___ ____ ___ AND IS NORMALLY ______
LEAK DETECTION PETER OPEN
LDP STAND FOR
LITTLE DICK PETER LEAK DETECTION PUMP
THE PURGE SOLENOID IS NORMALLY ___
OPEN
WHAT HAPPENS TO THE VAPORS STORED IN THE CHARCOAL CANISTER
ROUTED INTO THE INTAKE MANIFOLD WHERE IT IS BURNED IN THE ENGINE
WHERE IS THE HOSE TO THE CHARCOAL CANISTER LOCATED ON THE TANK
TOP OF CHAMBER
WHAT IS THE PURPOSE OF THE EVAP EMISSION CONTROL SYSTEM
TRAP AND HOLD GAS VAPORS
WHERE IS THE CHARCOAL CANISTER LOCATED
UNDER HOOD OR UNDER VEHICLE
WHAT IS ANOTHER NAME FOR EVAP SYSTEM
VOLATILE ORGANIC COMPOUNDS (VOC)
NAME THREE COMPONENTS OF THE EVAP SYSTEM
-CHARCOAL CANISTER -HOSES/LINES -VALVED
HOW IS THE ENGINE AFFECTED IF THE FUEL TANK IS FILLED TOO MUCH
-DAMAGED CAT CONVERTER -FAIL EMISSION -RICH AIR/FUEL MIXTURE
LIST 6 THINGS THAT CAN INCREAN FUEL TANK PRESSURE
-FUEL EVAPORATION RAPE -GAS TANK SIZE -FUEL LEVEL (LIQUID VS VAPOR) -FUEL SLOSH -TEMPERATURE -RETURNED FUEL FROM FUEL RAIL
THE PURGE VALVE IS CONNECTED BETWEEN THE _____ AND ________. DOES THE PURGE VALVE STAY ON OR PULSED
-INTAKE AND CHARCOAL CANISTER -PUSLED
LIST 4 ENGINE CONDITIONS WHEN THE COMPUTER CONTROLLED PURGING IS NOT ALLOWED
-OPEN LOOP -IDLE -DECCELERATION -WOT
WHAT COULD BE THE PROBLEM IF THE VEHICLE IS HARD TO START RIGHT AFTER REFUELING. WHY?
-PURGE VALVE -GAS FLOWS INTO THE INTAKE MANIFOLD WHICH CAUSES EXCESSIVE FUMES
WHAT 2 THINGS WILL HAPPEN IF THERE IS AN EVAP LEAK ON VEHICLES NEWER THAN 1996
-SET TROUBLE CODE -TURN ON MIL
THE LDP USES A _____ ATTACHED TO A _______ TO APPLY _____ PRESSURE TO THE ____ _____
-SPRING -DIAPHRAGM -7.5 IN H20 -FUEL TANK
WHAT IS THE NAME OF THE VALVE THAT ONLY OPERATED WHEN THE PCM IS TESTING THE SYSTEM? NORMALLY OPEN OR CLOSED?
-VENT VALVE -OPEN
ABOUT HOW MANY POUNDS IS 7.5 IN H20 ____ PSI
0.25-0.27
HOW MUCH VAPOR CAN THE CHARCOAL CANISTER HOLD
1/3 ITS WEIGHT
WHEN FUEL VAPOR MOLECULES ADHERE TO THE CARBON SURFACE OF CHARCOAL IT IS CALLED
ABSORPTION
