G 3500 1 Ton Van V8-454 7.4L (1989)
Evaporative Emissions System: Testing and Inspection
System Diagnosis - Except High Altitude
INCORRECT OPERATION MAY CAUSE:
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Poor idle, stalling and poor driveability, check for:
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Inoperative bowl vent valve
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Inoperative canister control valve
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Damaged canister
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Hoses split, cracked or not connected to the proper tubes.
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Evidence of fuel loss or fuel vapor odor, check for:
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Liquid fuel leaking from fuel lines, fuel pump or carburetor
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Cracked or damaged canister
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Inoperative canister control valve
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Disconnected, misrouted, kinked, deteriorated or damaged vapor hoses, or control hoses
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Bowl vent hose misrouted
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Air cleaner or air cleaner gasket improperly seated.
MAKE A VISUAL CHECK OF CANISTER
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Visual check of charcoal canister
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Cracked or damaged, replace canister.
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Fuel leaking from bottom of canister. Replace canister and check operation of total system.
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Check filter at bottom of canister. If dirty, plugged, or damaged, replace filter