Fuel line ideas?

[marine02ss]

I have a 68 camaro Im working on.I have dual intank walbros with a -8 fitting out of tank.Where should I mount the regulator near the tank or close to the engine.Ive heard pros and conns either way.Its a Fuel Lab regulator should I run the return all the way from the engine?Its a 408ci with Kenne Belle blower,AFR225s,etc....Here are some pics of my project:

Couple more pics on the ground,mounted the Fiske wheels and the steering column.

[marine02ss]

Little Update:304 SS mandrel tubing

Exhaust work

Tack welded

Trial fitting


Made power steering hose

[marine02ss]

Couple engine pics:

[XcYZ]

Originally Posted by marine02ss

I have a 68 camaro Im working on.I have dual intank walbros with a -8 fitting out of tank.Where should I mount the regulator near the tank or close to the engine.Ive heard pros and conns either way.Its a Fuel Lab regulator should I run the return all the way from the engine?Its a 408ci with Kenne Belle blower,AFR225s,etc....

Awesome pics! That's going to be a great car.

I'm running my regulator right outside the tank and dead heading the system.

[Payton King]

reg at tank.

[Speedster]

Blowers like more fuel. Is yours EFI or Carb? The whole concept of deadhead vs. return is fuel inertia. It takes a good pump to get the volume of fuel in the line moving against both high acceleration g-forces and high blower boost. Like anything else, depends on how you intend to drive your car. Dead head is fine for 95% of the cars.

[Pantera EFI]

When you "fill" your "dead head" with fuel vapor (bubbles), your engine will "hurt". There is no float in an EFI system.
Please allow the VAPOR to return to the fuel tank.

Lance

[XcYZ]

Sure, there are pros and cons to both ways, but the dead head system works great.

[camcojb]

Originally Posted by Pantera EFI

When you "fill" your "dead head" with fuel vapor (bubbles), your engine will "hurt". There is no float in an EFI system.
Please allow the VAPOR to return to the fuel tank.

Lance

I know you're an EFI guy and I'm just a hobbiest, so please explain how this is any different than running the regulator off the back side of the rails. Any bubbles still go through the rails first, right past (and into) the injectors. Even if regulated on the inlet side of the rails there's just as much of a chance for bubbles getting past. With the regulator at the rear you don't have the hot fuel running back to the tank, aggravating the fuel bubble issue with the higher fuel temps. You're still bypassing fuel, and possibly bubbles, just at the rear of the car. Guarantee fuel temps in the tank and at the pump are lower than any system that bypasses from the engine compartment.

GM bypasses from the rear filter also, seems to be a non-issue for them. You probably won't get me to change what's worked for me for many years, the last ten years all forced induction builds. But I would like to know the theory or reasons why my way isn't good, because I definitely don't know everything, or even close. I'd appreciate your professional opinion.

Jody

[sacarguy]

Originally Posted by camcojb

I know you're an EFI guy and I'm just a hobbiest, so please explain how this is any different than running the regulator off the back side of the rails. Any bubbles still go through the rails first, right past (and into) the injectors. Even if regulated on the inlet side of the rails there's just as much of a chance for bubbles getting past. With the regulator at the rear you don't have the hot fuel running back to the tank, aggravating the fuel bubble issue with the higher fuel temps. You're still bypassing fuel, and possibly bubbles, just at the rear of the car. Guarantee fuel temps in the tank and at the pump are lower than any system that bypasses from the engine compartment.

GM bypasses from the rear filter also, seems to be a non-issue for them. You probably won't get me to change what's worked for me for many years, the last ten years all forced induction builds. But I would like to know the theory or reasons why my way isn't good, because I definitely don't know everything, or even close. I'd appreciate your professional opinion.

Jody

Very simple.. with the continual flow of fuel you dont get fuel boiling like you do with a dead head system with such a low volumed of fuel flowing through it you are far far more likely to have fuel boil vs the large volume thats being constantly flowed through a return style system.


The bubles usualy come from fuel being heated by exhaust etc and boiling in the lines.. properly insulated and routed lines can help this tremendously however bypasing in the rear also means for a slower reaction time to preasure drop

The preasure has to drop through the whole line all the way to the front before the regulator in the rear responds.. that could be a 8-10 percent drop in fuel preasure at the injectors themselfs while onlyh a 1-2 percent at the regulator.

either way works .. but the up front return regulator is more efecient at keeping a contant supply and preasure at the fuel injector as the distance the preasure has to drop over is very minimal before the regulator responds

This is why you will never see anything other then a return reg mounted very close to the fuel rail on a serious efi drag car.

Regardless 99 percent of people here will never make the kind of power that it would be a issue at..

and Yes I do specialize in fuel injected forced induction at my buisness. I just made 1600 rwhp on my turboed drag radial car last night.