Fass questions
 

I have a 99 24v cummins and i am wanting a fass but dont wanna pay retail and my buddies got a fass 150hd for an 07 he said i could have for good price but idk if it would hook up?

The pump itself should be universal, but the 07 may have different connection to the tank, and definitely the injection pump.

Can u buy just the conections
And lines?

Id check the fuel pressure and the volume rating at said PSI. I know the Air Dog units have different heads and motors between brands for different pressure and volume requirements.