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Home >> Hummer >> 2007 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.0L - Troubleshooting >> Poor Fuel Fill Quality
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Poor Fuel Fill Quality

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
  • Fuel fill limiter vent valve stuck closed
  • Evaporative emission (EVAP) canister restricted
  • EVAP vent valve stuck closed
  • Restricted vapor lines
  • High fuel temperature
  • Fuel filler hose is pinched or kinked
  • Ignition switch ON, vent valve closed
Over fill
  • Pressure relief valve is stuck open or leaking
  • Fill limiter vent valve stuck open or leaking
Pre-mature shut-off of the fuel dispensing nozzle occurs immediately after engaging dispensing nozzle, tank empty
  • Faulty dispensing nozzle
  • Restricted vapor lines or fuel fill pipe
  • High fuel temperature
  • Inlet check valve at tank stuck closed, fill pipe full of fuel
  • Fuel tank full, gage not accurate
Pre-mature shut-off of the fuel dispensing nozzle, more than 1/8 of tank capacity dispensed
  • Kinked, pinched or plugged lines in fuel tank vent system
  • EVAP vent valve stuck closed or restricted
  • EVAP canister restricted
  • Fuel limiting vent valve stuck closed or obstruction at top of fuel tank
Fuel spit back
  • Restricted EVAP canister
  • High fuel temperature
  • Ignition switch ON, EVAP vent valve closed