At what point is it needed to plumb lt1 fuel rails in parralell

**toolman1981** · 11-21-2011, 09:12 AM

Hi I have a 94 z28 383 12.5:1 le2 heads 236 244 cam estimated 425RWHP im running a 255lph walbro and 42lb SVO injectors. My question is should I run the rails in parralell or stay stock. The car is done as far as power goes. If you are running a similar setup/hp level I would love to here from you. Thanks for any help.

**BIG CAT** · 11-21-2011, 04:32 PM

your stock lines will be more of a restriction than the rails will be.

***Fastbird*** · 11-21-2011, 06:43 PM

Run the stock lines as is. I'm a stock fuel system except for my dual in-tank 255's and the Adjustable Pressure Regulator on the rails (and the 85# squirters). So that's stock lines and rails, and I'm at around 900 Crank (767 RWHP) and not noting any issues.

***popo8*** · 11-21-2011, 06:46 PM

Im running the stock fuel system with the exception of the in-tank 340, the hotwire kit, the hypertech fpr and 60# injectors, and like Fastbird, that is a boosted set up...

**96LT1355Z28** · 11-22-2011, 07:32 AM

My current setup is nearly identical to yours LE2, 236/244, 385, 12.2:1, 42# injectors, 255lph pump w/ hotwire kit, using stock lines and regulator 420/421 rwhp/tq through an M6 and 9", no fueling issues.

**MoeHorsePower** · 12-27-2011, 08:19 AM

Originally Posted by Fastbird

Run the stock lines as is. I'm a stock fuel system except for my dual in-tank 255's and the Adjustable Pressure Regulator on the rails (and the 85# squirters). So that's stock lines and rails, and I'm at around 900 Crank (767 RWHP) and not noting any issues.

Originally Posted by popo8

Im running the stock fuel system with the exception of the in-tank 340, the hotwire kit, the hypertech fpr and 60# injectors, and like Fastbird, that is a boosted set up...

Yep, what they say, I have stock rails but -10 feed & -8 Return..722 RWHP, no problems..and more HP to come!

**toolman1981** · 12-27-2011, 12:11 PM

thanks for the advice.

**96famaro** · 05-26-2012, 04:03 PM

What fuel regulators are you boosted guys running?

***Fastbird*** · 05-26-2012, 04:40 PM

I'm running a Holley AFPR because it's a stock design, but really, the stock regulator is a 1:1 boost rise regulator, only reason for an adjustable is if you need a bump in base pressure from 43.5 @ 0 KpA / MAP.