i just put a walbro 255 in my truck, drove fine for a day now it sumbles and falls on its face above 3000 or above about 30% throttle.

do you think the problem is the pump or the Fuel pressure reg? i am running the 98 corvette filter with the regulator built in...

my first thought would be that i got a bad pump since it worked fine before i swapped pump, but before i pull the bed back off i thought i would ask ya'lls opinions