1. Refuel: Add gasoline to the tank. You may need to prime the fuel pump (see step 2), depending on the model year and how long it's been sitting empty.
2. Prime the Fuel Pump (possibly): Some older Ford Windstars might require priming the fuel pump after being completely out of gas. This is less common in fuel-injected vehicles but older models or those that have sat for extended periods might benefit. There's no universal method; some have a specific procedure in the owner's manual, while others may not. If your car doesn't start after refueling, and it's an older model, you might try turning the ignition key to the "on" position (but don't start the engine) for a few seconds, then try starting it. Repeat this a couple of times. This allows the fuel pump to build pressure.
3. Start the Engine: Once you've refueled, turn the ignition key to the "start" position and the engine should start normally.
If it *still* doesn't start after refueling and attempting to prime the pump, there could be a different issue beyond simply running out of gas. Possible problems include a faulty fuel pump, a dead battery (from repeated attempts to start), or something else entirely. In this case, you'll need to troubleshoot further or seek professional help from a mechanic.