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a walbro 255 is usually at the limit of what the stock, very thin and old wiring can provide, so a counterfeit isis one would surely go over the threshold, leading to voltage drop (and not enough fuel pressure / flow).
Very easy to check.If the voltage is ok (which i don't believe, my guess is you will have around 9-10V instead of 14-14.5V), the it probably is the pump.You need a fuel pressure gauge for that, Tee it after the fuel filter, block it under a wiper and go driving. You are supposed to get "boost" + 3bar (45psi) on it (so less than 45psi when under vacuum); if the pump is no good, the pressure will drop at speed on boost and / or at 4000+ rpm
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