I'm Buying A S Trim For A 96 Z28. I Have A 255 Fuel Pump Do I Need To Have The In Line Pump Too?

 

No, unless you go over about 500 rwhp.

 

My Walbro 255 lph pump (stock fuel lines) has no trouble supplying my system with 593 rwhp.

 

That's very surprising since my 255 lph wouldn't keep up with 550 rwhp. The fuel pressure was falling off 10 psi by the top of the rpm range. Keep in mind that the fuel pressure should increase pound for pound with boost.

 

really when I had the s-trim on my car said it whoa at a 1000 feet with the stock fuel lines, factory in tank and godzilla in line pumps with 510rwhp

 

I'm running the Walbro 255 lph HD; possibly the HD pump makes a difference? My car was dyno tuned by Jeff Creech on a wideband O2 dyno setup with an AFR at 12.0 and I have a A-pillar mounted fuel pressure gauge that shows no signs of dropping off.