Ongoing FRP issue solved?

[78f100]

I have some of the same surge, like whitemonster said mine got better when I turned down the pressure on the airdog. I also had a lot of noise from my hpfp/lines they were vibrating bad. I put a guage at the elite fuel block and was getting pressure surges, the ad couldn't maintain constant pressure above 14psi. I am going to tune the fuel pressure more and see what happens.

 

[Dzchey21]

You will see low pressure surging if the high pressure is surging. What you really need to look at is vcv and pcv

 

[IBSTROKIN]

I think the VCV and PVC are struggling to stay balanced with the ported rails

 

[78f100]

Will dual fuelers fix it? I think my hpfp is just weak it has 107k miles on it, I know dual fuelers is probably overkill for me now but I may go ahead with them idk yet. I need to do more testing to see for sure.

 

[IBSTROKIN]

Some are having issues with a pump that has less than 40,000 miles. It's hard for me to believe it's a weak pump

 

[Dzchey21]

I agree. The only thing a weak pump should do is have issues maintaining rail

 

[78f100]

I have noticed my fan engaged while at low rpm since I did this install, I think im gonna try unthreading the sensor also. My surge is also at 55 to 60 under light throttle. I have 60hp nozzles and rp is falling off to 18ksi at wot thats why I said I think my pump is weak. But I want to get this surge fixed and check everything out before I go changing hpfp's or adding dual fuelers. I spoke with Mike at KEM about the rp he said not much he can do with it falling off that much, I didnt mention the surge. I really need to spend some time in the truck with my ae checking everything. I hope you get it figure out and let us know soon...if I happen to stumble across a solution I will let you know.
Op do have airdog? The guys at elite told me I needed to turn the ad reg to 15psi but mine wont hold that even with the reg all the way in. When I turn the ad up any higher than about 13/14 psi it gets really noisy and the hpfp does also then it surges at idle. I know you guys already adressed that, just putting it out there incase im missing something. Im not a rocket scientist but there has to be a fix for this without going back to stock rails, would love to hear some tuners thoughts on this.

 

[IBSTROKIN]

Oh didnt realize you had 60hp nozzles. Sounds like the same issue I have except I hold rail pressure fine at WOT. I have stock injectors though. I also tried turning the airdog pressure up and had the same issues as you. The pump was making a terrible noise and rail pressure bounced all over at idle.