A fuel shortage can have several causes. Supply disruptions, refinery outages, transport constraints, local distribution problems and sudden increases in demand can all leave stations without a particular fuel, and they behave differently from each other. In the EU, member states are legally required to hold emergency oil stocks equal to at least 90 days of average daily net imports, or 61 days of average daily inland consumption, whichever is greater. Stocks of that size reduce supply risk, but they do not mean every station has every fuel available at a given time.
What national emergency stocks cover
The obligation comes from Directive 2009/119/EC, which requires member states to maintain minimum stocks of crude oil and petroleum products, and to put national laws in place to guarantee it. The threshold is the higher of the two benchmarks above, so a country importing most of its fuel is holding roughly three months of imports in reserve. The directive remains in force.
Reserves at national level and fuel in a particular tank in the ground are two different questions, with different timescales. A country can hold large stocks while individual stations are empty, because the constraint is often further down the chain than the reserve.
Why individual stations can run dry
A filling station is not a warehouse. It holds a working volume sized for normal turnover and is designed around regular tanker deliveries. The entire retail fuel system assumes a steady, predictable draw.
Break any link in that last stage and individual forecourts empty regardless of national reserves:
- Tanker driver availability. Moving fuel requires specifically licensed drivers. That workforce cannot be expanded in a week, and a shortage of drivers looks identical, from the forecourt, to a shortage of fuel.
- Terminal and depot throughput. Loading racks have a fixed hourly capacity. Reserves held as crude, or held far away, cannot be dispensed into cars at any speed the panic demands.
- Delivery scheduling. Rounds are planned days ahead against expected demand. Demand that doubles overnight does not politely wait for a rescheduled route.
- Refining and blending outages. A single plant going down affects specific products in specific regions, which is why one grade vanishes while others stay available: an important clue that the problem is logistical, not absolute.
How a demand surge empties forecourts
Demand is one mechanism among those listed above, and it is the one drivers take part in.
On any ordinary day, the fuel in a country's cars is spread across every level from nearly empty to full. Most people refuel when convenient rather than when necessary. That distribution is the invisible buffer the whole system depends on.
Now suppose people hear there may be a shortage. The rational individual response is to top up, and to fill completely rather than partially, and sooner rather than later. Nobody has consumed a single extra litre. But the collective tank has to move from roughly a third full toward full, and that transfer has to come through the retail network in days rather than months.
The forecourt cannot tell the difference between "everyone is topping up" and "everyone suddenly needs much more fuel". It empties either way. A surge of this kind can begin from an expectation rather than a supply failure, and it can ease once the topping-up wave passes, because the fuel has moved into vehicle tanks rather than disappeared. Where the cause is a refinery outage or a transport constraint instead, the timescale is set by that constraint, not by driver behaviour.
For the decision in front of you: national figures describe the supply picture, not the station you are driving to. What helps at the wheel is a recent report from that specific station.
Why recent station-level information matters
Station-level availability can change within hours, which is faster than static map data is updated.
Map data tells you where stations are and what they normally sell. During a shortage the question is which of them has fuel now, and that can change within hours, so a figure from yesterday describes a different situation than the one you are in.
A status shown without its age is also harder to act on: driving to a station that turns out to be dry uses the fuel you were trying to conserve. A timestamp lets you judge how much weight to give a report.
What to do
- Do not join the wave if you can avoid it. If you have half a tank and no long trip planned, waiting a few days is both the individually and collectively better move. The queue is largely made of people who did not need to be in it.
- If you must refuel, go at low-traffic hours. Deliveries usually arrive overnight or early; late evening and mid-morning are frequently worse than very early.
- Check the fuel type specifically. Because these events are usually product-specific and logistical, diesel and petrol and LPG frequently differ at the same site. "The station is out" often means one grade.
- Trust timestamps over everything. A confirmation from an hour ago beats any official statement, any average, and any status flag with no time attached.
- Report what you find, especially the negatives. "This one is dry" saves the next driver more fuel than "this one has fuel" saves them time. In a shortage the negative reports are the valuable ones, and they are the ones people forget to leave.
- Widen your radius before you widen your worry. Because the constraint is delivery logistics, stations slightly off the main routes are often the ones still supplied: the panic concentrates where the traffic already is.
How Refuelia can help
Station-by-station availability is not published as a feed. Reserve figures and delivery schedules are held at national and company level, and they do not say what is in a particular tank this afternoon. Drivers at the station are the ones who can report that.
So every availability report on Refuelia carries the time it was made, reports of an empty station count the same as reports of a full one, and a station with no recent report is shown as unknown rather than coloured as though it had been checked. Live fuel availability is the same rule set out in one place: which stations have been checked inside the 18-hour window, what was found, and what Refuelia will not infer from the stations nobody has checked.
Related: in August 2026 the US diesel refining margin passed $100 a barrel for the first time on record — what the $100 diesel crack means at the pump.