Recently, my 1996 F250 7.3 Diesel died on the road about a mile after switching the fuel tanks. It appeared to work fine before then.

Here is what I know:

- Front fuel tank has bad fuel (smells like paint thinner)
- Rear fuel tank has good fuel
- Truck won't start when I have the rear fuel tank selected
- Truck will start when I have the front fuel tank selected, but die after 5 minutes (if it has clean fuel from the rear tank)


What I have done:

- Replaced fuel filter already.
- Put some diesel stabilizer and some biocide in the tanks.


What should I do:

- Should drop the fuel tanks and empty them?
- Replace fuel lines?
- Check/replace rear fuel tank sending unit (does it have a pump?)?
- Any other advice?


What I don't know:

- Why did the rear tank stop working all of a sudden at the same time (diesel stabilizer?)?


Any help would be appreciated as this truck and platform are still pretty new to me!