To fill a car's gas tank with fuel. We need to stop and fuel up before getting on the highway.
fuel up
to fill one's tank with fuel. Let's stop here and fuel up.I need to fuel up at the next little town.
fuel up
v.
To fill the gas tank of a vehicle with gasoline or other fuel: The family fueled up the car before leaving for the lake. I fueled the truck up so we wouldn't have to stop. It's time to go; let's fuel up.