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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System - 4.6L (LH2) - Troubleshooting & Diagnosis) >> Poor Fuel Fill Quality

Poor Fuel Fill Quality

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Poor Fuel Fill Quality

Problem Causes
Definition: During the fueling process a continual, occasional or no fuel nozzle shut-off condition has occurred.
Difficult to fill
  • Fill limiter vent valve stuck closed
  • Evaporative emission (EVAP) canister restricted
  • EVAP vent valve stuck closed
  • Restricted vapor lines
  • High Reid vapor pressure or high fuel temperature
  • Fuel filler hose is pinched or kinked
  • Ignition switch ON
Over fill
  • Pressure relief valve is stuck open or leaking
  • Fill limiter vent valve stuck open or leaking
Premature shut-off of the fuel dispensing nozzle
  • Fill limiter vent valve stuck closed
  • EVAP canister restricted
  • EVAP vent valve stuck closed
  • Restricted vapor lines
  • High Reid vapor pressure or high fuel temperature
  • Ignition switch ON (EVAP vent valve closed)
Fuel Spitback
  • Restricted EVAP canister
  • High Reid vapor pressure or high fuel temperature
  • Ignition switch ON