Leaving it constantly exposed to air can cause the pump to suck in air and generate heat.
This can reduce the working life of your fuel pump significantly.
Allowing your tank to run low can also make room for sediment to build up in your tank.
Is it bad to have low gas?
When there’s not enough gas in the tank, the fuel pump doesn’t get the same level of protection as it would otherwise. If you run the car low on fuel consistently, you can wear out the fuel pump prematurely, over-stressing it and making it hotter.
Why you shouldn’t run your car low on gas?
The key bits of a fuel pump that tend to cause problems when you run your car low on fuel are the strainer, fuel filter and electric motor. In addition to overheating and prematurely wearing out the pump, running a car low on fuel tends to pull up the sediment that normally sits at the bottom of the tank.
What happens when you run your car low on gas?
Running a car low on fuel can cause even more harm to your vehicle by dredging up collected sediment from the tank’s bottom. Once this occurs, it can become difficult to run the car, as not enough fuel is making it to the engine. And as the fuel flow rate slows, the electric pump motor might overheat.
How low can your gas tank get?
As a general rule, most cars have about 2.5 gallons left in the tank when the gas light comes on. So depending on how many miles you get per gallon, you can probably go anywhere between 30-60 miles.