Birds of Prey (1973)

Harry Walker, X-military pilot, works for a radio station in Salt Lake City as a traffic helicopter pilot. While on his rounds he observes a bank robbery taking place and the abduction of a female teller. He follows, 1st the criminals in their car, then they transfer to a helicopter. Harry is running out of fuel so he stops on the road to flag down a tanker truck, gets fuel then continues the pursuit.