My snowmobile makes over 160 hp is almost 900cc and a pulse pump feeds (2) 40mm Mikuni flatslides. You don't need pressure with a carb setup, you need adequate volume. Horsepower is directly related to GPH of fuel consumed. Also, pulse pumps push better than they suck. A good pump with a good pulse signal could be found if you wanted and maybe a primer bulb like an outboard has. I would also mount the fuel closer instead of at the tail. How much do you really need to carry? Post up some pics when you get your system complete. I am very interested.It acctually not for a kart but to put on a micro sprint. The pulse pump will not push it up from the tail tank to the shut off valve witch is higher then the carb. I don'want to run a electric pump because I don't want to run a battery and regulater. Could run a pump off the motor if I could find one small enough, it only has to make 7 or 8 psi(only has to feed a Mikuni 41 mm carb).