Welcome to AF!
In this situation I would try adding some more fuel to the tank to bring the level up and see if that helps. like you said you don't know how much gas you actually have in your tank, you could not have enough to start the vehicle. How has the car operated prior to this issue,(starting, driving, etc.)?
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Thought for the Day… Alcohol does not make you fat - It makes you lean... against tables, chairs, floors, walls and ugly people.
If a prostitute here in America loses her job to a prostitute in India , is that considered "outwhoring"??-Jay Leno