b1010 vs actual frp and big pressure loss

log file from the past weekend, truck hooked good and ran decent but have a tremendous pressure loss, b1010 seems it ws working correctly I do have 52000 and 60000 ZERO out as the truck cam up to 5000rpm just about all pressure fell off. frames start about 400 at 419 and 420 notice the pressure loss. no codes present, I still have to test fuel pressure regulator and misc to make sure it isn't mechanical. first time it has done this here is a log file

any ideas what happened

Need a little more info on truck. Does it have a lift pump? Any other upgrades?

yes pull truck only turns 5400rpm full built with twin cp3 all required mods for competitive 2.6 truck