GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2003 🢒 H2 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Poor Fuel Fill Quality

Problem

Causes

DEFINITION: Difficulty when refueling the vehicle.

Difficult to fill
    • The check valve is stuck closed.
    • The fill limiter vent valve is stuck closed.
    • The evaporative emission (EVAP) canister is restricted.
    • The EVAP canister vent solenoid is stuck closed.
    • Restricted EVAP pipes
    • High Reid vapor pressure
    • High fuel temperature
    • The fuel filler hose/pipe is pinched, kinked or blocked.
    • The fuel feed hose, or crossover hose, is pinched, kinked or blocked.
    • The ignition switch is ON.

Over fill
    • The pressure relief valve in the fill limiter vent valve is stuck open.
    • The pressure relief valve in the fill limiter vent is valve leaking.
    • The fill limiter vent valve is stuck open.
    • The fill limiter vent valve is leaking.

Premature shut-off of the fuel dispensing nozzle
    • The check valve is stuck closed.
    • The fill limiter vent valve is stuck closed.
    • The EVAP canister is restricted.
    • The EVAP canister vent solenoid is stuck closed.
    • Restricted EVAP pipes
    • High Reid vapor pressure
    • High fuel temperature
    • The fuel filler hose/pipe is pinched, kinked or blocked.
    • The fuel feed hose, or crossover hose, is pinched, kinked or blocked.
    • The ignition switch is ON.

Fuel spit back
    • The check valve is stuck open.
    • The check valve is stuck closed.
    • The check valve is leaking.
    • High Reid vapor pressure
    • High fuel temperature

Liquid fuel in the EVAP canister
    • The fill limiter vent valve is stuck open.
    • The fill limiter vent valve is leaking.

Liquid fuel leak
    • The pressure relief valve in the fill limiter vent valve is stuck open.
    • The pressure relief valve in the fill limiter vent valve is leaking.
    • The fuel filler hose is loose or torn.
    • The fuel feed hose, or crossover hose, is loose or torn.
    • The fill limiter vent valve is stuck open.

Fuel odor
    • The pressure relief valve in the fill limiter vent valve is stuck open.
    • The pressure relief valve in the fill limiter vent valve is leaking.
    • The EVAP canister is saturated.