I did the hutch mod ($160 kit) and the harpoon mod (free) but they do not need to be done prior to running the fuel mix. I did start with a new fuel filter under the hood and carry a spare just in case.
Hutch mod instructions....(harpoon is mentioned within these instructions)... Welcome to guzzle's In-tank Hutch Mod Web Page I ordered the parts from Strictly Diesel. If you speak with them, they know what the "hutch mod" is. They may be out of stock on the website. here is the product link.