09 lmm with ppe hot +2 et RACE. Usually run it at lvl6.(425). not much difference from lvl 4. Couple questions. does ppe have a back down protection? truck never throws a low fuel rail pressure on any setting like my lbz did. Does the lmm have different fuel system? what gains would i get if i put a fass pump on?

You need a lift pump. You'll probably limp your trans shortly after. PPE does not have protection but your trans does.

You need a lift pump. You'll probably limp your trans shortly after. PPE does not have protection but your trans does.

what pump do you suggest and my fuel rail pressure never drops below 22k psi on lvl 6. what is everyones pressure with vs without lift pumps?????

what pump do you suggest and my fuel rail pressure never drops below 22k psi on lvl 6. what is everyones pressure with vs without lift pumps?????

I like airdog. I run 26000psi

Air Dog II 165 is what we sell the most of. No tank drop, installs in under 2 hours, and provides extra filtration and water separation to keep the injectors and cp3 happy.

Here is a link

Air Dog II 165 (http://www.alligatorperformance.com/airdog-pump-0110-duramax-adjustable-tank-drop-draw-straw-necessary-p-3867.html)

I like airdog. I run 26000psi

What kind of power did you gain after lift pump? Im just confused why I need a lift pump if Im kepping 22k psi pressure does a ppe hot tune try to get more then that?

This might be a stupid question. A cp3 is capable of putting out X amount of fuel to the motor, if a lift pump is put before it, how does the cp3 produce MORE then its capable???

it doesnt produce more than capable it juss keeps it at that max psi no matter how much u get into the throttle. it never drops off

it doesnt produce more than capable it juss keeps it at that max psi no matter how much u get into the throttle. it never drops off

K so I understand it is easier on cp3. What is a good strong fuel rail pressure? Thanks for input