We have bought Diesel
all over the Pacific, and the Carrib, and everywhere along the way! even from fishing
vessels at sea! Never had a problem, because the first thing I do when I bild or buy a new to me boat is put a fitting and a spicket at the lowest place on the tank! Then I can take any water
out of the tank and any algee also! Been working for me for over 40 years ! Never a problem I can't fix in 15 minutes at sea or at anchor! Just an old fishermans trick to save down time and years ago there were no tank cleaners anywhere !! Just a thought and it won't cost an arm or a leg to do !!