GM Service Manual Online
For 1990-2009 cars only

Concern

Causes

DEFINITION: Difficulty when refueling the vehicle.

Difficult to fill

    â€¢ The fuel filler pipe check valve is stuck closed.
    â€¢ The fill limiter vent valve (FLVV) on the evaporative emission (EVAP) canister is stuck closed.
    â€¢ The EVAP canister air filter is restricted or dirty.
    â€¢ Any restricted vapor lines or hoses
    â€¢ The EVAP canister has an internal blockage or restriction.
    â€¢ A fuel with high reid vapor pressure characteristics.
    â€¢ A high fuel temperature
    â€¢ The fuel filler hose/pipe is pinched, kinked, or blocked.

Over fill

    â€¢ The pressure relief valve in the fill limiter vent valve (FLVV) is stuck open.
    â€¢ The pressure relief valve in the FLVV is leaking.
    â€¢ The FLVV is stuck open.
    â€¢ The FLVV is leaking.

Pre-mature shut-off of the fuel dispensing nozzle

    â€¢ The fill limiter vent valve (FLVV) is stuck closed.
    â€¢ The EVAP canister air filter is restricted or dirty.
    â€¢ Any restricted vapor lines or hoses
    â€¢ The EVAP canister has an internal blockage or restriction.
    â€¢ A fuel with high reid vapor pressure characteristics
    â€¢ A high fuel temperature

Fuel spitback

    â€¢ The fuel filler pipe check valve is stuck open.
    â€¢ The filler pipe check valve is stuck closed.
    â€¢ The filler pipe check valve is leaking.
    â€¢ A fuel with high reid vapor pressure characteristics.
    â€¢ A high fuel temperature

Liquid fuel in the EVAP canister

    â€¢ The fill limiter vent valve is stuck open.
    â€¢ The fill limiter vent valve is leaking.

Liquid fuel leak

    â€¢ The pressure relief valve in the fill limiter vent valve (FLVV) is stuck open.
    â€¢ The pressure relief valve in the FLVV is leaking.
    â€¢ The fuel filler hose is loose or torn.
    â€¢ The FLVV is stuck open.

Fuel odor

    â€¢ The pressure relief valve in the fuel limiter vent valve (FLVV) is stuck open.
    â€¢ The pressure relief valve in the FLVV is leaking.
    â€¢ The EVAP canister is saturated with fuel.