Pinpoint Tests
Fuel System
Pinpoint Test
Pinpoint Test A: Slow to Fill
Normal Operation
Under normal operation, fuel should flow at a steady rate through the fuel tank filler pipe into the fuel tank. As fuel enters the fuel tank, air is vented through the filler pipe or the On-Board Refueling Vapor Recovery (ORVR) system.
This pinpoint test is intended to diagnose the following:
- Fuel tank filler pipe fresh air hose or recirculation tube, if equipped
- Fuel tank filler pipe
- Evaporative Emission (EVAP) system
- Fuel tank filler pipe check valve (part of the fuel tank filler pipe assembly)
- Fuel Limit Vent Valve (FLVV) (mounted on the fuel tank)
PINPOINT TEST A: SLOW TO FILL
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A1 CARRY OUT INSPECTION AND VERIFICATION
- Carry out inspection and verification. Inspection And Verification
- Was the cause of the concern found?
Yes
REPAIR or INSTALL new components to correct the concern.
No
GO to A2.
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A2 CHECK THE SYSTEM FOR ANY EVAP DTCs
- Connect the scan tool.
- Check the system for any of the following EVAP DTCs: P0446, P0451, P0452, P0453, P0454, P1450, P1451 and P260F.
- Are any of these DTCs present?
Yes
REFER to Computers and Control Systems to diagnosis the EVAP system.
No
GO to A3.
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A3 MONITOR THE FTP WHILE FILLING THE FUEL TANK
- Monitor the Fuel Tank Pressure (FTP) reference value while filling the fuel tank. Refer to Computers and Control Systems.
- Is FTP within specification?
Yes
GO to A5.
No
GO to A4.
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A4 MONITOR THE FTP WHILE FILLING THE FUEL TANK WITH THE EVAP SYSTEM DISCONNECTED
- Disconnect the fuel tank-to-EVAP canister quick connect coupling at the EVAP canister. Refer to Quick Connect Coupling Quick Connect Coupling.
- Monitor the FTP reference value while filling the fuel tank. Refer to Computers and Control Systems.
- Is FTP within specification?
Yes
INSPECT the EVAP system for blockage or restrictions. REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL new EVAP system components.
No
GO to A5.
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A5 CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION
- Remove the fuel tank filler pipe assembly. Refer to Fuel Tank and Lines Fuel Tank Filler Pipe.
- Inspect the fuel tank filler pipe and fuel tank filler pipe fresh air hose or recirculation tube (if equipped) for a blockage or restriction.
- Is the fuel tank filler pipe or fuel tank filler pipe fresh air hose or recirculation tube (if equipped) blocked or restricted?
Yes
If possible, REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL a new fuel tank filler pipe. REFER to Fuel Tank and Lines Fuel Tank Filler Pipe.
No
GO to A6.
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A6 CHECK TO MAKE SURE THAT THE FLVV IS FUNCTIONING CORRECTLY
- NOTE: The Fuel Limit Vent Valve (FLVV), is mounted externally on the fuel tank.
- Remove the FLVV. Refer to Evaporative Emissions Service and Repair.
- Invert the FLVV. Listen for a clicking noise in both directions.
- Was a clicking noise witnessed?
Yes
FLVV is OK. RETEST the system for normal operation.
No
INSTALL a new FLVV. REFER to Evaporative Emissions Service and Repair.
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