I'm just building the fuel supply for my twin turbo car and not sure what is best for fuel supply lines to run from the tank to the engine.So far I have the following.
Aeromotive twin 340lph pump/baffle system with #6 outlets in a home built fuel tank.
The engine is a built LS3 with a FiTech ultimate LS 70013, and 80lb injectors and BTR stage 2 twin turbo comp cam. Twin 66 On3 turbos.
This build is for strictly gasoline because we don't have E85 here in Ontario,Canada.
The plan is to use a single pump until 5lbs boost or so then have pump # 2 start.
So what is the most efficient way to feed this beast?

Two #6 lines to a boost reference regulator
Two pumps into a "Y" to One #8 to the regulator

Preferred location of the fuel regulator before the fuel rails or after?
Please just answer my questions about the fuel supply. I know the FiTech is not the best system but it is what I have.
Thank you for the help.

Aleck
Will one #6 be big enough for the return?

 

I would run pumps into a single 8an up to the rails. Regulator after rails. A single 6an return from regulator is fine. You could probably run 6an up if you wanted to and be fine as well.

I'm assuming a max crank hp of roughly 1000hp?

 

Yes that would be more than enough power for a 2600# car for sure.
Aleck

 

Solid recommendation above on the lines. You always want to run the regulator after the rails to make sure the fuel pressure is maintained for both rails. Good luck and enjoy the project. Grand Bend is opening in early May.

 

X3.

6an would be fine.

 

The owners of Grand Bend announced that they have bought St Thomas dragway and are repaving the complete track and installing all new concrete barriers. This is great news for the sport and gives us two nice tracks both 30-40 minutes away from London.
Aleck

 

That's awesome news. I haven't been over to St Thomas in a long time. Sounds like I'll be running across the bridge again this summer.

 

Funny,you come over here,and we go over your way.

 

I have 8n feed from the tank to the back of the drivers rail. Jumps to the passenger side on the front then the rear pass side goes to the regulator. 6an return from there to the tank

Better option is to use Y’s... mine works fine though

 

In my opinion, you only run one damn fuel pump. Lots of people on here successfully run 2 or 3 pumps, but why?If one pump fails, the motor quits running. If one of 2 pumps fails, the motor goes lean enough to may be a problem. If one of 3 pumps fails, your motor is getting just enough fuel to grenade on you.

 

What in tank pump will do 1000+ l/h? How do you avoid heating the fuel with that much pump going all the time?

Do you use redundant regulators? If you dont and it fails you'll grenade your motor.

 

This is a street car first,plus going to the track once a month. No need to run one big pump for cruising and idling. I had thought about using a pump from a Demon as oem stuff should last.But the duel set up made more sense with having the second pump turn on after 5lbs of boost. Also not having a computer to tune with pulse width helped with the decision.

 

Wouldn't the Magnafuel 4303 make 1000hp on gas? Good for a single pump.

 

Most guys making that kind of power, are doing so with E. It's much harder to get 1 pump to move enough E to support 1k, and it's CHEAPER to run 2 pumps. 1 big pump is high $, 2 400 pumps are less than $200.

 

 

I run a squash performance fbody pump really nice unit , little pricey but I think it's the best pump out there for a fbody, if you want more pics let me know , it has twin walbro 450 274s but I also just built a guy a pump bought a factory China pump for 25 bucks, 2 walbro 450 274s off a guy on ebay for 200gotta watch the walbro knock offs, can give you this guys info if you need it for genuine, but it's super tight to get the 2 pumps in the basket but z heat gun helps. A 3/8 barbed tee and a bag of 5/8 hose clamps and a ft of hose is all you need. I job welded the hole made for wires to run thru fuel hat , but you can get a 4 wire bulkhead and use original plug for gas gauge. Heres a pic or 2, I could build you one

 

 

Take the regulator out of the pump with the clip and now you have a return system ready for aftermarket regulator

 

Run 8an or 10 ptfe , 10 to filters to y block to 8an into back of both rails, sometimes feeding one rail then jumping to other can cause vapor lock but then come out the front 8 an to your regulator inlets, 6an return is fine but 8an would keep fuel cooler, check valve in the return helps with bleed down, heres a pic of my rail regulator setup, 8 orb to 10 orb swivel