The Federal Aviation Administration has ordered more inspections of Boeing 737 wiring around fuel tanks.

The FAA, continuing its focus on tank safety, said Monday it was requiring all airlines to inspect the fuel boost pump wiring on Boeing 737-100 through -500 series aircraft with 20,000 to 30,000 flight hours. That adds up to a little more than one to two years of flight time.The agency said the inspections were necessary to ensure the aircraft do not have a problem with chaffing and electrical arcing between the fuel boost pump wiring and surrounding tubing that carries the wires through fuel tanks.