I have one of these boxes and I only run it on the 150 tune for the time being and it seems like I am running out of fuel up in the 2700 RPM range I am making like 25 PSI of Boost when it falls on it's face-:t . I have no modifications to my fuel system as far as lift pumps or filtration. Last night I changed trhe fuel filter thinking it was dirty and that seemed to help a bit but I still am not getting to the 3200 RPM redline I would think that the stock fuel system would have enough capacity for the 150 tune at least. How much should I expect from the stock fuel system? anyone have any past experience?:confused:

I had a similar issue with the box I ran on my LB7, I was told that a lift pump would help since that box demands so much fuel. Might try it and see.. There are tons of pumps to choose from, so do your homework.

I have the same setup and haven't had any problem till last weekend. I had it on 200 and a was running a Camero and about 80mph it shut down. No power,wouldn't rev,nothing. I shut the truck down for a few minutes and everything was fine. It's done it a couple times since too. It also throws the Service Engine light. I think it'screating low rail pressure cause of no Lift Pump :o: as GMC2500HD stated but I'm not sure cause I don't have a code reader. 2700rpm sounds about right too. Mine's not in the truck now as I'm waiting for EFI but it will probably go back in for a couple days until I get it so I can race at stoplights :D .

Thanks for the info...