Gramps has it right, folks.
Yeah, one cup of bleach and possibly 90 gallons of fuel. BUT THE BLEACH WILL NOT MIX WITH AND BECOME DILUTED BY THE FUEL. And yeah, there is a water separator in the fuel filter. But there might be a metal fuel tank, and some of the fuel lines will be metal, and they will react rapidly with the bleach, throwing all kinds of******into the fuel stream, to be caught by the filter (maybe, maybe not). Any trace of that bleach gets to the injection pump, and there goes a $2,000 part right there. Any injector it gets to is toast, too. And if any trace of that junk gets into the fuel lines, you have to replace everything, injection pump, injectors, fuel lines, filter head, fuel tank, the works.