GMC 1999 Sierra 1500 Pickup Owner's Manual page 293

6. Close the water drain valve and connect a hose going from the air bleed
valve port to a fuel-resistant container. The inside diameter of the hose
should be one-eighth of an inch.
for the starter to cool. Do this until you can see clear fuel coming from
the air bleed valve.
7. Turn your ignition key to Start for 10 to 15 seconds. Wait one minute
8. Close the air bleed valve and replace the fuel tank cap.
9. Start your engine and let it idle for five minutes. Be sure to check your
fuel filter for leaks.
Fuels in Foreign Countries (Gasoline Engines)
If you plan on driving in another country outside the US. or Canada,
unleaded fuel may be hard to find. Do not use leaded gasoline. If you use
even one tank full, your emission controls won't work well or at all. With
continuous use, spark plugs can get fouled, the exhaust system can corrode,
and your engine oil can deteriorate quickly. Your vehicle's three-way catalytic
converter and oxygen sensor will be damaged. All of that means costly
repairs that wouldn't be covered by your warranty.
To check on fuel availability, ask an auto club, or contact a major oil
company that does business in the country where you'll be driving.
You can also write us at the following address for advice. Just tell us where
you're going and give your Vehicle Identification Number (VIN).
General Motors of Canada Ltd.
International Export Sales
Post Office Box 828
Oshawa, Ontario L1H 7N1, Canada
6-1 5