The government said it had requisitioned six workers at a TotalEnergies depot in Dunkirk, northern France, and would do the same at its Feyzin depot in the southeast this afternoon.
The government has already requisitioned staff elsewhere, a move vehemently opposed by the CGT, which has called on other workers to join its protest.
But even so, petrol supplies will take some time to get back to normal.
Transport Minister Clement Beaune told France Inter radio that petrol stations might still have problems until next week, adding: "We're still struggling."
According to government data, roughly one in three petrol stations has not been supplied normally in the last few days.