Officials say aviation fuel was pumped into cars after it was mistakenly delivered to three New Jersey gas stations.
Authorities closed a station in Lawrence, and two in Hamilton after the error was discovered.
Mercer County spokeswoman Julie Willmot tells The Times of Trenton the stations will remain closed until all underground storage tanks, lines and filters are emptied and cleaned.
State officials are investigating how the mistake happened.
Several cars stalled on Friday when a gas station in Keyport and one in Manasquan unknowingly pumped jet fuel into their tanks.