Fuel feed line(s) size for <750rwhp at ~10.5-11 afr?
 

I am going to use 2 supra pumps (-6 outlets) and am trying to decide what size feed line or lines to use. I have heard a bunch of different answers based on theory from the non-rotary Aeroquip and Earl's dealers I have spoken to. I would like to see what people have had success with. My power goal is between 600-650rwhp at around 11:1 AFR and <16psi. Chances are I will never exceed that, but I wouldn't mind having the ability to throw some race gas into it and shoot for a number north of 700rwhp on the dyno. I am also concerned about weight, complexity, and cost so I ony want to go as big as I need to. With all this in mind here are the options:

2 -6 feed lines
1 -8 feed line
1 -10 feed line

What do you guys recommend?

Dont the walbros flow more than the supra pumps? I say run 2 -6 or -8 lines from each pump into a fuel splitter then run -10 all they way to the front then split it back into each fuel rail, this is what i 'm planning on going with.

I'm going to use 2 Walbro pumps (rated @ 500hp each) with 2 -6 lines and I looking to make the same HP you are looking to make. That should be enough fuel for your HP needs.

I would imagine 1 -8 would be sufficient. I've decided to use the stock lines and see if I can squeeze 550rwhp out of it. -6 is stock I believe. I'm using stock primary rail with 550's and k2rd secondary rail with 1600's.

-Destin

Im using two supra pumps, using the stock feed line and return lines as my feed lines and the charcoal canister line as my new return line.

In the engine bay the two feed lines are connected into a -10 fuel block which is going to connect to the primary rail.

So basically 2 -6 feed lines connected to a -10 line, to the primary rail

im using -8 feed and stock -6 return. twin walbros for delivery. KG parts fuel rails with 550s and 1600's

-8 should be more than enough.

If I had the money, I'd go dual-sump, dual -6 feed to the front, dual fuel pumps - one for each rail.


-Ted

I run two 044 pumps two -8 lines in to 1 -10 line(Y) one -8 return to reg . have no fuel problems at all. makes over 800rwhp

sorry and my a/r is at 10.3 @ 24psi of boost 810rwhp 91mm thumper turbo 20b c16

I'm planning on running E85 on the 3rotor once i go boosted so that will require about 30% more fuel demand.

I have dual supra TT pumps. 2 3/8th" feed lines (one for each feed). 1 3/8th" return line.

I'm running a sumped stock tank through an inline filter, to an Aeromotive Eliminator external pump. -10 from pump to engine bay, Y'd with -8 to each rail (parallel). -8 to FPR, and -8 return. Current injectors are 1680's and 850's.

Setup is ported (intake & exhaust), 13b housings, A-Spec GT42R (1.15a/r) kit. Our fuel goals are about the same Destin.

Dee runs a -10 feed and more than 10 injectors on his methanol 2 rotor drag car. Therefore, I think a single -10 or even a -8 will be fine for me given my power goals on std fuel. With that said, I will probably end up using 2 -6 feed lines instead of a -10 since it will be easier to route the smaller lines under the intake manifold and I can use off the shelf rails.

Running two supra TT pumps, using 2 -6 feed lines into a -10. Joined right after the pumps.

-10 feed to the engine bay where it goes through an inline filter, to primary rail, secondary rail, and FPR. Using -8 return.

1680 pri, 850 sec

Could I encounter problems running two -6 lines into a -10?

Will the supra pumps flow enough to maintain fuel pressure in a -10 line under wot?