Grand AM V6-3.4L VIN E (2001)
Fuel Tank Unit: Testing and Inspection
DESCRIPTION
The fuel tank leak test is used to locate any fuel or fuel vapor escaping the fuel tank area. Fuel vapors escaping above the fuel level will be detected
when the Evaporative Emission (EVAP) diagnostics completes one test cycle. The Malfunction Indicator Lamp (MIL) will illuminate after the EVAP
diagnostics completes two test cycles.
DIAGNOSTIC AIDS
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Operate the vehicle under the condition of the customers concern. Under high temperature conditions fuel vapors may increase to the point of
EVAP canister vapor saturation. Fuel vapors would then be released into the atmosphere. Once the engine is running and EVAP purge is enabled,
all fuel vapor release would be eliminated.
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Test for fuel leaking in the following locations:
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The fuel tank
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The fuel feed and return pipes
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Test for fuel vapor leaks in the following locations:
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The fuel tank, fill limiter vent valve and rollover valves
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The fuel fill pipe, hose and fuel fill cap
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The fuel sender housing and seal
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The Fuel Tank Pressure (FTP) sensor seal
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The EVAP vapor pipe
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Movement of the EVAP pipes or fuel pipes may help find an intermittent condition.
TEST DESCRIPTION
