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Discussion Starter #1
I just bought a 2005 F250 with 145k, just had ARP studs, headgaskets, Bulletproof EGR, oil cooler, all new injectorsdone with 4" MBRP duals. I was wondering if there is anyway to know if the blue spring update has been done.
 

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No way except to open Fpr and look at it. Too many other factors can effect fuel pressure so high or low pressure readings won't tell about that. If the short original style spring is in it the blue should raise the pressure. If your fuel pump is weak or lines restricted a blue spring won't help until those issues are resolved.
 

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Discussion Starter #3
Thanks, the truck runs great I am just trying to find out what all has been done to this truck.
 
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