Fuel
Top Tier Fuel
GM recommends the use of TOP TIER Detergent Gasoline to keep the engine clean, reduce engine deposits, and maintain optimal vehicle performance. Look for the TOP TIER Logo or see www.toptiergas.com for a list of TOP TIER Detergent Gasoline marketers and applicable countries.
Recommended Fuel
If the vehicle has a yellow fuel cap or a yellow sticker on the fuel door, E85 or FlexFuel can be used. If the vehicle does not have a yellow fuel cap or yellow sticker, do not use gasoline with ethanol levels greater than 15% by volume. See E85 or FlexFuel 0 186. Use regular unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 87 — (R+M)/2 — or higher. Do not use gasoline with a posted octane rating of less than 87, as this may cause engine knock and will lower fuel economy.
Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) - 2020 - CRC - 6/11/19
186 Driving and Operating Prohibited Fuels
Caution
Do not use fuels with any of the following conditions; doing so may damage the vehicle and void its warranty: . For vehicles that are not
FlexFuel, fuel labeled greater than 15% ethanol by volume, such as mid-level ethanol blends (16–50% ethanol), E85, or FlexFuel.
. Fuel with any amount of methanol, methylal, ferrocene, and aniline. These fuels can corrode metal fuel system parts or damage plastic and rubber parts.
. Fuel containing metals such as methylcyclopentadienyl manganese tricarbonyl
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Caution (Continued)
(MMT), which can damage the emissions control system and spark plugs.
. Fuel with a posted octane rating of less than the recommended fuel. Using this fuel will lower fuel economy and performance, and may decrease the life of the emissions catalyst.
Fuels in Foreign Countries
The U.S., Canada, and Mexico post fuel octane ratings in anti-knock index (AKI). For fuel not to use in a foreign country, see Prohibited Fuels 0 186.
Fuel Additives
TOP TIER Detergent Gasoline is highly recommended for use with your vehicle. If your country does not have TOP TIER Detergent Gasoline, add ACDelco Fuel
System Treatment Plus−Gasoline to the vehicle’s gasoline fuel tank at every oil change or 15 000 km (9,000 mi), whichever occurs first. TOP TIER Detergent Gasoline and ACDelco Fuel System Treatment Plus−Gasoline will help keep your vehicle’s engine fuel deposit free and performing optimally.
E85 or FlexFuel
Vehicles with a yellow fuel cap can use either unleaded gasoline or fuel containing up to 85% ethanol (E85). All other vehicles should use only the unleaded gasoline as described in Recommended Fuel 0 185. The use of E85 or FlexFuel is encouraged when the vehicle is designed to use it. E85 or FlexFuel is made from renewable sources. To help locate fuel stations that carry E85 or FlexFuel, the U.S. Department of Energy has an alternative fuel website. See www.afdc.energy.gov/afdc/locator/ stations.
Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) - 2020 - CRC - 6/11/19
Driving and Operating 187
E85 or FlexFuel should meet ASTM Specification D 5798 or CAN/ CGSB–3.512 in Canada. Do not use the fuel if the ethanol content is greater than 85%. Fuel mixtures that do not meet ASTM or CGSB specifications can affect driveability and could cause the malfunction indicator lamp to come on. The starting characteristics of E85 or FlexFuel make it unsuitable for use when temperatures fall below −18 °C (0 °F). Use gasoline or add gasoline to the E85 or FlexFuel. Because E85 or FlexFuel has less energy per liter (gallon) than gasoline, the vehicle will need to be refilled more often. See Filling the Tank 0 187. The only GM approved aftermarket additive is ACDelco Fuel System Treatment Plus-FlexFuel. Follow the instructions on the bottle for proper use. This product is available at your GM dealer.
Caution
Some additives are not compatible with E85 or FlexFuel and can harm the vehicle's fuel system. Use only additives approved by GM for E85 or FlexFuel vehicles. Damage caused by unapproved additives would not be covered by the vehicle warranty.
Caution
Do not use fuel containing methanol. It can corrode metal parts in the fuel system and also damage plastic and rubber parts. That damage would not be covered under the vehicle warranty.
To help keep the engine running efficiently, fill the tank with gasoline, up to E15, after filling the tank with E85 one or two times.
Filling the Tank
An arrow on the fuel gauge indicates which side of the vehicle the fuel door is on. See Fuel Gauge 0 99.
Warning
Fuel vapors and fuel fires burn violently and can cause injury or death. Follow these guidelines to help avoid injuries to you and others: . Read and follow all the
instructions on the fuel pump island.
. Turn off the engine when refueling.
. Keep sparks, flames, and smoking materials away from fuel.
. Do not leave the fuel pump unattended.
. Avoid using electronic devices while refueling.
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Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) - 2020 - CRC - 6/11/19
188 Driving and Operating
Warning (Continued)
. Do not re-enter the vehicle
while pumping fuel. . Keep children away from
the fuel pump and never let children pump fuel.
. Before touching the fill nozzle, touch a metallic object to discharge static electricity from your body.
. Fuel can spray out if the fuel cap is opened too quickly. This spray can happen if the tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any hiss noise to stop, then unscrew the cap all the way.
To open the fuel door, push and release the rearward center edge of the door. Turn the fuel cap counterclockwise to remove. When refueling, hang the fuel cap from the hook on the fuel door. Fully insert and latch the fill nozzle, begin fueling.
Warning
Overfilling the fuel tank by more than three clicks of a standard fill nozzle may cause:
. Vehicle performance issues,
including engine stalling and damage to the fuel system.
. Fuel spills.
. Under certain conditions, fuel fires.
Be careful not to spill fuel. Wait five seconds after you have finished pumping before removing the fill nozzle. Clean fuel from painted surfaces as soon as possible. See Exterior Care 0 264. Reinstall the cap by turning it clockwise until it clicks. Push the fuel door closed until it latches.
Warning
If a fire starts while you are refueling, do not remove the fill nozzle. Shut off the flow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately.
Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) - 2020 - CRC - 6/11/19
Driving and Operating 189
Caution
If a new fuel cap is needed, get the right type of cap from your dealer. The wrong type of fuel cap may not fit properly, may turn on the malfunction indicator lamp, and could damage the fuel system and emissions system. See Malfunction Indicator Lamp (Check Engine Light) 0 103.
Filling a Portable Fuel Container
Warning
Never fill a portable fuel container while it is in the vehicle. Static electricity discharge from the container can ignite the fuel vapor. You can be badly burned and the vehicle damaged if this occurs. To help avoid injury to you and others:
. Dispense fuel only into
approved containers. . Do not fill a container while
it is inside a vehicle, in a vehicle's trunk, pickup bed, or on any surface other than the ground.
. Bring the fill nozzle in contact with the inside of the fill opening before operating the nozzle. Contact should be maintained until the filling is complete.
. Do not smoke while pumping fuel.
. Avoid using electronic devices.
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