With the arrival of summer, millions of residents and visitors in Spain set out on road trips. Long journeys across the country require special attention to the condition of the vehicle—and especially to the fuel level in the tank. Despite its apparent simplicity, the question of when exactly to refuel remains relevant for many drivers.
There are often two opposing strategies: some prefer to refuel only when the gauge is near empty, while others don’t wait for even half a tank to replenish their fuel. However, experts note that both approaches can have undesirable consequences for the vehicle.
The optimal time to refuel is considered when the fuel level is near a quarter of a tank—approximately 20-25% of full capacity. Refueling too early isn’t harmful, but doesn’t offer any particular benefit either. However, regularly driving on an almost empty tank can lead to serious breakdowns.
When the fuel in the tank runs low, the pump starts drawing in the remnants, which may contain debris and sediment. This increases the risk of clogging the filter and damaging the fuel pump. Diesel engines are especially vulnerable to these issues, as air entering the system can disrupt injector performance and lead to costly repairs.
Additionally, during the hot months of the year, when air temperatures in Spain reach their highest levels, engine overheating becomes an added risk. Running low on fuel can worsen the situation, as the fuel pump is cooled by gasoline or diesel flowing through it. If the fuel level is too low, the pump operates under more stressful conditions and wears out faster.
Experts advise not to wait until the reserve warning light comes on. It is better to plan refueling stops in advance, based on the fuel gauge readings. This proactive approach can help avoid unpleasant surprises on the road and save on repair costs.
Special attention should be paid to long trips through sparsely populated areas, where distances between fuel stations can be significant. In such cases, it is recommended not to let the fuel level drop below a quarter of a tank to avoid getting stranded far from populated areas.
Overall, proper refueling organization is not just a matter of comfort, but also of caring for your vehicle’s technical condition. Following a few simple rules will help make summer travel in Spain safe and enjoyable.
