When a station is asked and is not able to help within the next 30 minutes we remove them from the list for 30 minutes.
We do this so we don't waste your time in asking them again when we already know the answer.
The petrol stations decide when we should show them in the results list, mainly based upon when they will have more than 1 member of staff working. So some days you might find a petrol station is shown in the list, and on others they won't be.
This is one of the reasons why fuelService lets you check before you travel so that you don't waste time and effort going to a petrol station that can't help.