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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Poor Fuel Fill Quality

Poor Fuel Fill Quality

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Problem Causes
DEFINITION: During the fueling process a continual, occasional, or no-fuel nozzle shut-off condition has occurred.
Difficult to fill
  • Fill limit vent valve (FLVV) stuck closed - Located in and serviced by the fuel tank or fuel pump module.
  • Evaporative emission (EVAP) canister restricted
  • EVAP vent valve stuck closed
  • Hose between canister and canister vent solenoid twisted or kinked if applicable
  • High fuel temperature
  • Fuel filler hose is kinked
  • Faulty dispensing nozzle
  • Ignition switch ON, vent valve closed
Over fill
  • Fill limit vent valve (FLVV) stuck open or leaking - Located in and serviced by the fuel tank or fuel pump module.
  • Fuel inlet check valve stuck open
Pre-mature shut-off of the fuel dispensing nozzle occurs immediately after engaging dispensing nozzle, tank empty
  • 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, gauge 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
  • Fill limit vent valve (FLVV) stuck closed or obstruction at top of fuel tank - Located in and serviced by the fuel tank or fuel pump module.
Fuel Spitback
  • Restricted EVAP canister
  • High fuel temperature
  • Ignition switch ON, EVAP vent valve closed