2006 Volvo XC90 Fuel Pump Adapter Harness

[cgillett]

Hi everyone, need some help.

I have a 2006 Volvo XC90 T5. The car starts, idles, accelerates up to aboutt 40-50 mph and then if I need to pass another car, it shudders, stutters until it kicks in.
Changed filters, plugs, injectors, mass air flow sensor. Finally bought a new pump as it showed on the meter that it was not holding the pressure on high rev.
After getting to the old pump, the harness doesn't match. Question 1: I read on another thread that there might be an adapter harness. If so, where can I get one?
After putting everything back together (using the old pump), the car works smoothly. No issues accelerating, passing, etc. Question 2: Could it have been the fuel module that we unhooked while messing with the pump? Do I still need to change the pump?