A cummins is completely different that a duramax in almost every aspect. Our tanks don't have in tank pumps like the cummins do. The injection pump pulls fuel from the tank and that is the exact reason why you want an air dog, fass, ppe etc. to take the strain off of your injection pump. I'm hate to burst you and your buddies bubble but I highly doubt he has a 900hp cummins that is being fueled by a walbro.. Especially if he thinks its going to work better than a fuel system that not only pulls fuel but filters water and particles as well.
well he does have a 898hp 15??ftlb at the wheels dodge. its twin turbo with supporting mods of course,all done by him,no nitrous or propane or water meth. also has a 1000hp nova,full tube chassis etc. i think he was just trying to help me out with price and longevity more than compare his dodge to my chevy. basically he said they fail all the time,and are kinda noisy. thats all. and i have also read that there are many problems with them. but thanks for your input