There’s always a Taco Bell around and there are lots of vegan options available there. The 7 Layer Burrito is vegan w/o the cheese and sour cream and you can have the bean burrito fresca style (no cheese). You can even order a crunchwrap, sub beans for meat and remove cheese and sour cream. The Power Bowl is vegan w/o the sauce.
Hours vary by location–visit the website for more details.