After Doing my FPR Upgrade My truck seems to be runnign weird

[112motorsports]

Like the title states I updated my FPR spring to the blue spring and the truck starts a heck of a lot easier now, however it seems to be surging a little. Also when I mash the gas it just does not seem to have the same power as it did before. I don't know if the spring has to seat but I am a little concerned that something wen't wrong here. Please let me know if anyone has experienced any of this issues. It might just be all in my head as I sure hope so, but I am not sure. Thanks again.

[MWilbur516]

I experienced the same thing when I did my FPR upgrade. I believe that you have some air trapped that will work itself out. Do you have a fuel pressure gauge? My pressure started out at about 72psi @ idle. I didn't have any surging to speak of, but I did feel a very slight power loss mainly in the low end. It passed and my injectors are much happier now.

[112motorsports]

I do not have a fuel pressure guage yet. It seems my bottom end power has dimished. I hope it is the air in the system. Is there any way to bleed the system to rid if of the possible air traped? When you say your injectors are much happier now what do you mean? Did the power come back over time? Thanks again.

[sinner6.0L]

it's all in your head. rest easy knowing the bump in fuel pressure is doing nothing but good for wear and tear on your injectors

[SickStroke6.0]

Can you describe the surging you are experiencing?

[sinner6.0L]

here's a cut and paste quote from the fmc boards regarding the upgraded regulator

The injector will actually create an internal low pressure area under the plunger so intense(if the fuel pressure is low) that the fuel will "cavitate" or boil creating compressable bubbles within the injector. When this happens, the high pressure oil will cause the intensifier piston to overtravel and bottom the return spring inside the injector. This hard metal to metal impact hammers the injectors to death internally. The higher fuel pressure eliminates the cavitation. Assuming the filters, pump and pickup are all ok this will increase the injectors durability.

[112motorsports]

The surging is only at about 1200 rpm. The truck feels like I am on and off the power very sutle though. The truck does not surge on start up or when I mash the go peddle. The surging is only happing for a few seconds here and there it is not consistent by any means.

[bdavis91]

how much have you driven the truck since you did the update

[nylyon]

Originally Posted by sinner6.0L

here's a cut and paste quote from the fmc boards regarding the upgraded regulator

I always wanted to know the reason of why fuel pressure played a role on injector life. Great information. To the OP, when I installed the FP spring, I didn't notice much difference, certainly not a surge.