best fuel setup for turbo????

[X]

The plan...
blowthru 225 3.7L slant 6
350 holley
8.4 to 1 CR
msd 6al with elec dist.
custom made water cooled ic and headers...
mild ported head/ mild cam
If I get everything working right i'll go with forged pistons
t3/t4 or t04 turbo

Now the one thing I was thinking is the fuel system...
I know the mechanical fuel pump can be referenced for boost but I am unsure how reliable it would be at higer boost ...15psi or higher...

Now I would use an electric fuel pump on a turbo carb setup with a return line... should this be done similar as FI vehicles with and fmu?

since fmu's works by "closing" the return line to increase the fuel pressure

now what about an elec fuel pump with a single line??

what is Does10 using?

Thanks

 

[Does10s]

We're using a Mallory 4309 regulator. It's boost referenced and we've had it up to 28psi. The fuel pump is a Carter Inline EFI pump capable of flowing enough fuel for 550hp. Fuel lines are 3/8" aluminum (AN-6) with a 1/2" (AN-8) pickup in the tank. The return line is routed into the fuel tank filler neck.
Piece of cake!
Will

 

[kirkallen143]

Howdy,
I've been pondering, what if you ran the Mallory regulator and a boost referenced fuel pump? Would it act as a doubler to the fuel psi? Maybe not, because the regulator is only going to give you a max psi anyways, right?
What I am trying to solve, or experiment with, is would it be applicable to run a fuel filter(which has a return port on it) after the boost referenced fuel pump with a 1/4" return line back to the tank, which is vented via the gas cap. Wondering if this set-up would act like the Mallory regulator. Thinking this should supply enough fuel under boost even with the return line. At least it would keep a cooler charge. What about some sort of check valve in the return line from the filter? Thinking outloud here. Or just bite the bullet and buy the boost refernced regulator, heck probably don't need one in the first place!
Kirk ' 73 bronco

 

[Anonymous]

I have two versions planned for my 200.

Version one: 5 gallon cell in spare tire hole, fuel goes from cell to Holley "red" pump, (maximum pressure is 7 PSI) http://www.holley.com/HiOctn/ProdLine/P ... 801-1.html
Then fuel goes from holley pump to factory fuel pump, (boost referenced) then to carb.

I put pressure to the factory fuel pump vent hole with a rubber tipped blowgun hooked to a regulated source. It started to leak from the "arm hole" right away, to my disappointment. I figured it was already junk, so I kept turning up the pressure to see where it would "pop" at.
I went all the way to 30 psi, and while it continued to leak air it never got any worse. I figure that is good enough, so I drilled the vent hole a little larger and epoxied a tube in place for the boost reference.

That is version one, we'll see how it works out....



Version Two:

My '84 is EFI originally, so I am going to use the in tank pick-up with a 255 lph EFI pump. From there, it is going to a manifold I made which mounts an aftermarket Kirban adjustable EFI fuel regulator. I will adjust it down to 20 psi with vac hose off, and it will be boost referenced to the bonnet. The fuel that is not bypassed back to the tank then goes to the regular boost referenced regulator (non-bypass, it is what I already have).

I decided to do that , becuase I think taking fuel pressure down in two steps will be easier to manage than trying to do it with one regulator. (in theory, at least...)

There are a lot of guys on turbomustangs.com that have problems with their fuel pressure going straight from the EFI pump to the regulator, to the carb.


Will's set up (Does10s) seems to be working well for him, you can give it a try!