I also want to add this:

After flushing with a hose put like a gallon of diesel in it and then drain it. That will get rid of most of the water from flushing.

When you fill it up for the first time don't let the car sit but try to drive it as much as you can. If you let it sit then the leftover water will settle at the bottom of the tank and you won't be able to start. Water is heavier than diesel.