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 vent tube, if equipped

- Fuel tank filler pipe

- Evaporative Emission (EVAP) system

- Fuel tank inlet check valve (part of the fuel tank)

- Fuel level vent valve, if equipped (part of the fuel tank)

PINPOINT TEST A : SLOW TO FILL

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.

A2 CHECK THE SYSTEM FOR ANY EVAP (Evaporative Emission) DTCs

- Connect the scan tool.

- Check the system for any of the following EVAP (Evaporative Emission) DTCs: P0446, P0451, P0452, P0453, P0454, P1450, P1451 and P260F.

Are any of these DTCs present?

Yes
REFER to Computers and Control Systems Information to diagnose the EVAP (Evaporative Emission) system.

No
GO to A3.

A3 MONITOR THE FTP (Fuel Tank Pressure) WHILE FILLING THE FUEL TANK

- Monitor the Fuel Tank Pressure (FTP) reference value while filling the fuel tank. Refer to Computers and Control Systems Information.

Is FTP (Fuel Tank Pressure) within specification?

Yes
GO to A5.

No
GO to A4.

A4 MONITOR THE FTP (Fuel Tank Pressure) WHILE FILLING THE FUEL TANK WITH THE EVAP (Evaporative Emission) SYSTEM DISCONNECTED

- Disconnect the fuel tank-to-EVAP (Evaporative Emission) canister quick connect coupling at the EVAP (Evaporative Emission) canister.

- Monitor the FTP (Fuel Tank Pressure) reference value while filling the fuel tank. Refer to Computers and Control Systems Information.

Is FTP (Fuel Tank Pressure) within specification?

Yes
INSPECT the EVAP (Evaporative Emission) system for blockage or restrictions. REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL new EVAP (Evaporative Emission) system components.

No
GO to A5.

A5 CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION

- Remove the fuel tank filler pipe assembly.

- Inspect the fuel tank filler pipe and fuel tank filler pipe vent tube (if equipped) for a blockage or restriction.

Is the fuel tank filler pipe or fuel tank filler pipe vent 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 or fuel tank filler pipe vent tube.

No
GO to A6.

A6 CHECK THE FUEL TANK INLET CHECK VALVE

- Inspect the fuel tank inlet check valve for restriction or sticking.

Is the fuel tank inlet check valve restricted or sticking?

Yes
If possible, REPAIR the restrictions. If the restriction cannot be repaired, INSTALL a new fuel tank.

No
INSTALL a new fuel tank.