Fuel system.
 

Has anybody built a fuel system for a 6.0 using a Airdog or a Fass pump and doing away with the stock pump/ I mean new lines from the tank to the pump and then to the heads? What parts and pump would be used being that you have to hold 55# of pressure.

Yes, Fass has lits utilizing the stock pump or without. Check out their description catalog here:

http://www.fassride.com/FASS-descrip...ionCatalog.pdf

All the 150 and 95 Series are currently on sale, let me know if we can be of further support.
Kenny
707-580-6782