A shortage of fuel-making facilities is pushing U.S. gasoline and diesel prices to record levels, just as drivers prepare for the summer driving season.

Gasoline prices topped $4 a gallon in all 50 U.S. states in recent days for the first time ever, even though global crude oil prices have pulled back from highs reached during the early days of Russia’s invasion of Ukraine. U.S. oil prices are hovering around $115 a barrel, down from more than $120 a barrel in March.