i was wondering when you put on and external fuel pump can you leave the stock fuel pump in? I am putting forced induction on my car and know i have to upgrade my pump so i was just wondering if i can just put an external pump on.

 

yeah, if its a booster (high pressure-inline, like a vortech t-rex) you just put it in sequence. i hope your not planning on trying to make over 500rwhp with a setup like that tho.

 

i was planning i using the walboro 255 intank pump and then later on putting an external pump for the higher horsrepower at high RPM. I will be looking for about 750 to 800 hp on the turbo and close to 500 NA.

 

the stock lines, rails, and those pumps arent going to support that much boosted power. your brake specific fuel consumption is always higher on a power adder motor. take the amount you need for 500rwhp NA, double it, and thats the about how much youll need for 700rwhp w/ a power adder.