Look at Post 74 this thread. Didn’t make to the fuel dispenser. I understand your point about plastic tanks. I didn’t go to the video frame by frame but it looked to me like the fuel line was severed early on in one of the cars and left a flaming trail. Didn’t look like the fuel tanks got ripped out immediately.
Pregnant woman, unborn child IDed by coroner as 2 of 6 victims killed in fiery Windsor Hills crash
https://abc7.com/windsor-hills-crash-victims-fatal-accident-collision/12101320/
I see now that it didn't actually get to the pumps, but she rammed at least five cars at a high rate of speed. The first was hit in the rear sideways, and that's going to be the weakest point. This likely severed the fuel tank/lines and left the trail, but honestly, it doesn't take much gasoline to get a huge fire going. There's a lot of plastic and fabric to burn.