Hey fella's

I have a 5.3 with mods in sig on my 2000. I just installed a procharger p1sc with 8.1 marine injectors... I have the stock fuel pump in now with 70000 miles on it. I have a walbro 255lph in the mail.. My question is should I wait to install it before I tune it or will I be okay? And should I regap my plugs for the blower? I believe there at .060 now??

 

The higher capacity fuel pump is just to raise the amount that the fuel system will flow before dropping pressure, so no need to tune for it. You will need colder-burning spark plugs, but leave the gap the same.

 

IMO I would wait for the fuel pump before tuning. One less thing to worry about when going to the dyno.