I've got a p-pumped 24V in my first gen. Best thing I ever did was put in a 94-98 style fuel pump. It will maintain 30psi up to around the 700hp level. It falls off a bit from there. I plumbed a 180gph/45psi FASS into the front of the pump to supply extra fuel when i dyno or drag race the truck(toggle switch). My experience has been that with intermitent use the FASS will last a year or 2. Probably 1 hour of total run time. If it is used continuously they last 4 months to a year. I know others will swear by them but this is number 4 for me. The piston pump always works, period. You must have a cam with the lobe for the fuel pump(not stock 24V) to use it. My new motor will use a gear driven pump on the front cover. The 6.7 block does not have provisions for the 94-98 style pump.