LB7: LB7 fuel rail pressure wont build

[ThatBlueDuramax]

Today i was just driving normally and i peeked over at my fuel rail pressure gauge on my insight and i noticed the pressure wouldn't rise past 10,000kpsi. i gave her more throttle even full throttle and still would go past 10,000. so i thought hmm maybe i just needed to turn the tuner up (efi live), i tuned it up to tune 5 and itll usually get up to 23,000 at WOT but nope at WOT still wouldn't go past 10k and was lacking a lot of power. No codes concerning fuel problems and i do have a lift pump. injector balance rates were normal. PLEASE HELP ME FIND THE PROBLEM

 

[hondarider552]

Any low fuel rail codes?

 

[ThatBlueDuramax]

Nope not yet atleast

 

[duramaxdiesel]

I was going to say something about your fuel filter, but if you don't have any fuel related codes...

 

[2004LB7]

No codes doesn't really mean anything. Tuner could have turned them off or changed the parameters for setting them

What pressure do you get at idle and in neutral pressing the throttle? Does it go higher?

Can you run efilive's DVT controls to test pressures?

 

[ThatBlueDuramax]

At idle it sits at 5.0 to 5.2 and yes it goes up in neutral

 

[JoshH]

What is desired?

 

[ThatBlueDuramax]

5.2kpsi

 

[Chevy1925]

pretty sure he means when you are cruising down the road and trying to get it to go above 10k, what is the desired at WOT or anything that should be going higher than 10k?

 

[MAXX IT OUT]

I am glad someone else has had this issue, because I was going to start the a similar thread. I was towing a trailer today and the truck didn't want to get out of it's own way. I also tried all my different tunes, not much differents. I took this video so show what was going on. This was taken at WOT, ECT were higher than I thought they should be, and EGT were at 1200-1300. Funny thing was that after I parked, in park it would build full rail pressure and on the drive back everything was fine.
https://youtu.be/9T9xTPQU-xo