John Denver’s family believes a faulty fuel selector valve in his experimental plane caused the crash that killed the singer in 1997. Denver’s plane lost power after the valve got stuck, said Bill Wimsatt, a Los Angeles lawyer representing the singer’s children and mother in a lawsuit against several companies. “You’ve got a situation where a fellow is trying to do nothing more than switch tanks on his aircraft. It results in a loss of power and a loss of control, with nothing, likely, that the pilot could have done to prevent it,” Wimsatt said in the Monterey (CA) County Herald. The lawsuit, which was filed in October, names as defendants Imperial Eastman Corp., Mark IV Industries and Dayco Eastman, along with others. Denver died Oct. 12, 1997, off the coast of Pacific Grove CA when his home-built Long E-Z airplane ran out of fuel and fell into the ocean.