* Fuel Pump Inertia Switch: Many cars, including some 2003 Chevys, have an inertia switch that cuts power to the fuel pump as a safety feature in case of a collision. Running out of gas might have caused a minor jolt or jarring that tripped this switch. Locate the inertia switch (usually in the passenger compartment, often under the dash or in the trunk) and check if it's tripped. There's usually a button to reset it.
* Low Fuel Pressure: Even if the inertia switch isn't tripped, running completely out of gas can cause the fuel pump to overheat and become damaged or temporarily inoperable due to lack of lubrication. This is because the fuel itself helps lubricate the pump.
* Damaged Fuel Pump: If the car sat for a prolonged period after running out of gas, the fuel pump might have suffered further damage from overheating or other issues.
* Battery: Although less likely to be the primary cause, running the engine until the very last drop can put a significant strain on the battery, especially if the car relies on an electric fuel pump (which is likely). A weak battery could prevent the starter motor from cranking the engine. Check the battery voltage.
Troubleshooting Steps:
1. Check the Inertia Switch: This is the easiest and quickest thing to check first.
2. Check the Battery Voltage: Use a multimeter to measure the battery voltage. It should be around 12.6 volts when fully charged. If it's low, jump-start the car or charge the battery.
3. Listen for the Fuel Pump: Turn the ignition key to the "on" position (without starting the car). You should hear a brief humming sound from the fuel pump. If you don't hear it, the pump might be faulty or not receiving power. This indicates a problem with the pump or its associated circuits, potentially the relay.
4. Check the Fuel Pump Relay: Locate the fuel pump relay (usually in the fuse box under the hood or in the passenger compartment) and try replacing it with a known good one.
5. Add Gas: Once you've checked the above, add several gallons of gas.
Important Note: If you've determined the fuel pump is likely the problem, DO NOT attempt to repeatedly crank the engine. This could further damage the fuel pump or other components.
If none of these steps solve the problem, you will likely need to have a mechanic diagnose the issue. They have specialized tools and experience to pinpoint the fault accurately.
