1. Wait and See: Sometimes, after running completely out of gas, the fuel pump needs a moment to re-prime. Wait at least 10-15 minutes after filling the tank. Try starting the vehicle again.
2. Check the Fuel Pump: If it still doesn't start, the problem might be the fuel pump. Running completely dry can damage the pump over time because it relies on the fuel for lubrication. A weak or failing fuel pump won't be able to deliver fuel to the engine even after the tank is full. You may hear a humming sound from the fuel pump when you turn the key to the "on" position (but not cranking). If you hear nothing, this is a strong indicator of a failing fuel pump.
3. Check the Fuel Filter: A clogged fuel filter could restrict fuel flow, even with a good pump. This is less likely to be the *sole* cause if you've recently run out of gas, but it's worth checking as part of a broader diagnosis.
4. Check the Fuel Pressure: This requires a fuel pressure gauge and some mechanical knowledge. If you are not comfortable performing this check, you should take the vehicle to a mechanic. Low or no fuel pressure confirms a problem with the fuel pump, filter, or the fuel lines.
5. Check the Ignition System: While unlikely directly related to running out of gas, make sure the battery is charged and the connections are clean and tight. A weak battery might not have enough power to turn the engine over when the fuel pump is already struggling. Test the spark plugs to see if you're getting a spark.
6. Check for Air in the Fuel Lines: Running out of gas could sometimes introduce air into the fuel lines. This can prevent the engine from getting a proper fuel/air mixture. This is a slightly more advanced issue and may require professional attention.
7. Immobilizer System: While less likely, if your Suburban has an immobilizer system (check your key fob), there's a very small chance it's malfunctioning or has been triggered in conjunction with the fuel issue.
What to do next:
* If the car still won't start after waiting and performing basic checks (battery, connections), you should call a roadside assistance service or have it towed to a mechanic. Diagnosing fuel pump, fuel filter, and fuel system problems requires specialized tools and expertise. Attempting to fix these issues yourself without the necessary knowledge could lead to further damage.
Don't continue trying to start the car repeatedly if it won't start. This will only drain the battery further.
