07 lbz p0087

[zuhlke07]

Any way to check to see if my fass is keeping up with the volume of demand for fuel?

Replaced rubber hoses by Trans and under the hood, by the brake booster, and the outlet of the fuel filter head.
Added a sump,
Changed to a sportsman cp3.
Rail plug
Ported rail fitting


I have idaho rob built Trans max effort tunes.. Level 4 is around 160hp i think. Level 5 is around 230hp.

Well I'm getting p0087, edge shows demand is 26k rail, and actual is about 6k low, in level 5.. and it doesn't come back up..

Level 4 it asks for 26k, drops to like 19k, and slowly rises up.( haven't stayed in it long enough to see if it comes all way to desired).

Making me wonder if my fass 150 is weak...?

 

[rgullett83]

Miles? Your injectors may be returning to much fuel

Sent from my SM-G900V using Tapatalk

 

[clrussell]

Miles? Your injectors may be returning to much fuel

Sent from my SM-G900V using Tapatalk

This ^^^

 

[zuhlke07]

191k

Figured so as well

 

[DAVe3283]

It could just be the CP3 as well. The FASS can move enough fuel for 700+ HP without breaking a sweat. A +230 HP tune won't be a problem for the FASS. But it might be for the CP3, especially if the injectors are returning too much fuel.

I had a stock CP3 until 300k miles, and it would only do about 525HP on known good injectors.

 

[zuhlke07]

Has a brand spanking new cp3 sportsman pump

 

[Awenta]

Time for a return rate test

Sent from my SM-N910V using Tapatalk

 

[UGAfsuFAN]

Look at this thread as well

http://www.duramaxdiesels.com/forum/showthread.php?t=25170

Check your fuel line under your truck alongside the transmission and just under the filter. See if they're soft and kinked. If so you might need to do the repair in the thread above. Worth a look.

 

[Brent@LDS]

Injectors with high return rates will cause this issue! See it a lot here.

 

[zuhlke07]

Have replaced the fuel lines as well.

Yeah figure injector issues

 

[elliottw]

X2 check your return rates