Short answer
The low fuel light means the tank is down to its reserve. How far that reserve takes you depends on the car, the tank and how you drive, so treat it as a prompt to refuel at the next station, not a range to test. Running a tank dry can strand you and is hard on the fuel pump.
Is it safe to keep driving?
Yes, to the nearest station. How far the reserve lasts differs by car, so do not test it — and on many cars running near empty is hard on the fuel pump.
What causes the low fuel light?
Most common first. Symbols and meanings vary by manufacturer; your owner's manual has the definitive meaning for your model.
- Fuel is low. The level sender has dropped to the reserve point the manufacturer chose. That point, and the range left, differ between cars.
- Faulty fuel level sender. If the light or gauge disagrees with a recent fill-up, the float in the tank may be sticking or its sensor worn, giving false readings.
What should you do right now?
- Refuel at the next opportunity.
- Avoid long climbs, heavy loads and high speed until you do; they use fuel fastest.
- If the gauge reads wrongly after a fill-up, have the sender checked.
What does the fix usually involve?
Usually nothing beyond filling up. If the gauge is wrong, a shop tests the level sender, which on many cars is part of the fuel pump assembly inside the tank.
If the car ran dry and will not restart after refueling, the pump may need a few key cycles to re-prime; diesels may need their fuel system bled. Ask for help rather than cranking the engine for long.
How much does it cost to fix?
Often nothing — see the causes above. The cost depends on what is actually wrong.
A typical range, not a quote. Actual cost depends on the car, the shop and the fault.
Common questions
How many miles can I drive after the low fuel light comes on?
It differs between cars. Many drivers quote a few dozen miles, but the real figure depends on tank size, the reserve the manufacturer chose and how you drive. Some cars show a miles-to-empty estimate; treat it as optimistic.
Is it bad to drive on low fuel often?
On many cars the in-tank pump is cooled by the fuel around it, and running near empty often can shorten its life. It also risks pulling sediment from the bottom of the tank. Refueling at a quarter tank avoids both.
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