Why run 2 fuel lines all the way up?

[sittonb]

Been reading a bunch of builds, and it doesn't seem to matter the engine style, everyone seems to run the fuel line and return line all the way up and back, why doesn't anyone use Breeze Fuel Filter/Regulator and Single Line Kit? It combines the filter with a regulator and allows the return line to completely stay in the rear. I know it's a bit extra, but seems less trouble (only one line run), slightly cleaner engine compartment etc.
Granted it's not adjustable, and doesn't have a gauge on it, that honestly does look sorta cool, but just wondering if I'm missing anything by considering it.

[Al_C]

I believe this item is one that falls into the realm of personal choice. My opinion is if you're good with the fixed fuel pressure (as I understand it these systems were originally designed for Corvette applications) and you like the looks of a single line to the engine bay, then go for it. It's your build...

[edwardb]

Just to be clear, you're talking about a return style fuel system. Typically used on high pressure (compared to carbs...) EFI systems. Fuel pumped is delivered at a specific PSI and what's not needed is returned to the tank. I've done a couple builds with both lines to the engine compartment and the regulator on the firewall. No big deal but agree putting the regulator and return line at the back near the fuel tank does simplify things a bit with only one line running all the way to the engine compartment. The combined fixed regulator and filter is a GM part used I believe on certain year Corvettes and perhaps others. Many have used it successfully. There's no reason you couldn't use an adjustable regulator. The Gen 3 Coyote, for example, is supposed to be 65 PSI. Which doesn't match with the fixed 58 in the GM piece. Granted, having the regulator in the back isn't very handy. But my experience is once set they don't change. In fact, am doing this with my current 35 Hot Rod Truck build. That's an Aeromotive Universal 13129 Bypass Regulator.

https://thefactoryfiveforum.com/attachment.php?attachmentid=151472&d=1627779109

[Otee453]

Breeze kit worked well for me. Just modify the fuel pump access hole in the sheet aluminum in the trunk floor, making it larger to access the regulator/filter in case you ever need to replace or fix it in the future

[edwardb]

Breeze kit worked well for me. Just modify the fuel pump access hole in the sheet aluminum in the trunk floor, making it larger to access the regulator/filter in case you ever need to replace or fix it in the future

Or locate it in a spot that's accessible from the bottom.

[Hacksaw84]

In these applications it probably is really just about preference, either would work ok. In a more technical situation its for accuracy and minimizing the pressure drop in the system and more specifically as seen at the fuel rail/injector. The less that still has to happen after the regulator the more likely the injector is to see the desired pressure. Not that its needed but I actually regulate after the rail. Supply feeds directly into both rails then the regulator measures the pressure on the output and returns to the tank. I have a fuel pressure gauge on my dash which measures at the rail and when I hammer on it you see a decent amount of drop. I would assume that a tank mounted one would see more and experience some lag. Although again, probably marginal in these applications.

[ggunter]

Like most have said, it's all a matter of preference. I run the breeze setup with a single line with a dash fuel pressure gauge and see no real drop in pressure when I pounce on it, maybe five pounds,I like the simplicity of one line, it works well for me but mine is just a driver. Maybe if it were in a race application I woulld run a return.

[jts359]

On my Studebaker I ran a return line back to tank to Eliminate a problem these cars have which is called Vapor lock , The flow back to the is controlled by a .047 fitting on the return line , I haven't had my Cobra long enough to see if its prone to vapor lock , Ed

[Jim1855]

I ran an Aeromotive bypass regulator plumbed after the carb. Solved percolation problems at high ambient temps and/or altitude. Gives the gas at pressure a place to go rather than blowing past the needles and seats.
Jim

[bobl]

Here is a good reason to run a return style system. Without a return from the fuel rail the fuel is dead headed all the way from the tank. If you run out of fuel for instance, the engine will not start and run properly until all the air is displaced from the fuel line and fuel rails. With return to the tank the air pumps right through as soon as the pump comes on. That is the reason you see so many applications with some sort of fuel reservoir and boost pump setup. We fought this a lot in the early days of EFI in marine applications. They did not use a return to the tank. In later years most went to a reservoir and low pressure boost pump. So is that a real problem for our cars? Probably not, but it is a consideration.

[sittonb]

thanks for all the replies, wanted to make sure there wasn't a reason I was missing. Understand the need for a return, my engine will have a Holly Sniper. The Breeze uses a regulator built in with the filter, so fuel is returned to the tank. It seems a few use it but most don't. Something to think about I guess.

[JohnK]

Holley actually makes a returnless setup now, where the regulator is in the tank with the pump.

https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_4bbl_tbi_kits/sniper_4bbl_tbi_master_kits_with_fuel_system/

[edwardb]

thanks for all the replies, wanted to make sure there wasn't a reason I was missing. Understand the need for a return, my engine will have a Holly Sniper. The Breeze uses a regulator built in with the filter, so fuel is returned to the tank. It seems a few use it but most don't. Something to think about I guess.

You do understand it's fixed at 58 PSI, right? It's an acceptable alternative only if that's the pressure required for your setup. Granted maybe not a lot of people know about it. But it's also not an exact match for some systems.