found deisel water and gas in my tank

[HUM GOOD]

I stopped at a local mom and pop gas station and topped off my tank. 1 mile down the rode the truck died. Roadside delivered it to my dealer. They called fuelpump. 85,000 miles not a surprise to me. But when they began to drain the tank they found LOTS of water and a blue tint which they say is deisel.
they say:
needs tank
needs all new injecters
plus seal kits
etc.

am I safe to just have them flush out and put fresh gas in with some injecter cleaner and be on my way?

They claim the injecters are in danger of contamination.

I have a meeting set with the owner of the gas station tonight. I am going to have him pay for this or take him to court.