injectors
 

i was told that i could use john deere injectors in my 12 valve cummins, is this true, if so which ones, also, ive been looking for a fuel leak on my truck and have not been able to find it but its somewhere between the fuel filter and the low pressure lines on the frame

even if they would fit, i don't think the horse power rating is good enough for your truck.

i was also told i can get rid of the metal fuel lines and replace with rubber diesel line

Get them out of a John deere 450 d excavator, they are rated 300 hp. good injector for your truck.