Yes, Diesel Doctor does work. I have had algae in my diesel fuel. You will know when the plastic filter gets clogged and the engine shuts off. Use clear(see thru)filters and check often by shining a flashlight up thru the filter. When it gets clogged, change it.It may take a few tubes of Diesel Doctor,and a few filters, but don't despair. You will get the algae out.
Bill Lewallen Lexington,Ky.