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I don't think you are making enough power to drain the pump canister, even if that is what the symptoms indicate. You can screw up your engine very easily if that's the case. I'd say scan it when it acts up and we'll look at it, except the engine could get damaged in the process.
It's all-important to monitor fuel pressure and AFR at this point. You did not have this issue when you ran it at the track, so it could be due to the new pump. All the Walbros I've used have a high pitched characteristic sound, which gets more pronounced when the pump is stressed. Heat-soaking combined with low fuel level in the tank, then accelerating can stress it. What are the specifics of the pump installation, such as wiring upgraded, venturi line provision, fuel pressure gauge, etc.? Then of course scanning for KR and misfires for each cyl, injector duty cycle, AFR,while watching fuel pressure closely....Also, what is the Walbro part# on the pump itself?
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