For 1990-2009 cars

### Diagnosing Fuel Fill Problems - L61

Symptoms for a blocked inlet path will include:

• | The inability to dispense fuel at anything above a trickle rate, if that. Fuel is evident at the fill head.

• | The nozzle will shut-off virtually immediately, since no volume of fuel can be dispensed.

• | Suspect a stuck inlet check valve. Check for operation with a siphon hose.

Symptoms for a blocked/restricted vent path include:

• | Pre-mature shut-offs of the fill nozzle at medium to high flow rates.

• | The nozzle will shut-off after dispensing only 0.76-0.14 L (0.2-0.3 gal). It may be less with higher temperatures and/or higher RVP fuels. After a few second wait, this process can be repeated.

1. Connect the scan tool and check for DTC P0440, P0446, or P1441.
2. Verify the vent path:

• | Turn the ignition ON with the engine OFF.

• | Using the scan tool, monitor the fuel tank press sensor.

• | Normal fuel tank pressure sensor signal voltage with no pressure or vacuum should read between 2.3-2.8 volts.

• | Check the vent path from the EVAP vent solenoid backwards to isolate the problem component (vent solenoid, vent pipe/hose, canister, FLVV (fill limit vent valve), etc.).