Assistance diagnosing fuel supply problem

[Burn Down]

Hmm, never mind I just found the thread... Looks like it is idle that can be affected.

 

[catmenace]

Don't know what that means. They are LBZ stock FPR's and the EFI live updated for them.

 

[catmenace]

Engine runs great until WOT. That is when you get the Fluctuation in fuel delivery.

 

[Burn Down]

I thought you had dual fuelers... It was JDDAVE I would suspect the cp3 then. Do you have another to try?

 

[catmenace]

I have the PPE Dual CP3. Maybe one is weak...could that cause it? I am wondering if the PPE CP3 control module is malfuntioning

 

[Burn Down]

I don't have dual fuelers but I would try taking it back to a single pump. Throw a stock belt on & take the ppe control off...

 

[LBZ]

First off have you changed all your fuel filters?
Secondly has it always done this or was fine for awhile with no other changes done to the engine or fuel system or to the tuning and then all of a sudden it started surging?

Going back to a single pump is another good way to check if it's the second CP3 or controller that is giving you issues.

 

[catmenace]

Thanks.....Fuel filters were changed and it has always done this since the dual CP3 has gone in. We will attempt to go back to a single pump to see if that makes a difference.

 

[JD Dave]

Did you ever get this problem fixed. My truck is still doing the exact same thing with twins. I'm ordering a new controller. I need to start replacing stuff to find the problem as this has gone on for to long.

 

[Dallas S]

are you still running your stock fuel pickup?

 

[JD Dave]

I have a sump.

are you still running your stock fuel pickup?

 

[Bonestock]

Bad cp3 controller.