phew, got it done... i prefilled both FS1022 and FS1212, but i used a medical syringe to suck the fuel from the center of old filters and injected into the perimeter holes of the FS1022 (this is the one cummins says do not prefill). i made sure i didn't touch the center hole and no single drop of fuel went to it. yay, after done, it started on the first attempt.