Fuel Lines & Fittings

[RPnova]

I'm ready to do the plumbing for my Sniper EFI and have lots of questions. I purchased a Sniper EFI fuel tank. I want to use my existing 3/8" steel line that I made going from the tank to the engine bay from my carb setup, which will be more than adequate. But how do I connect the steel line to an EFI hose to the gas tank? Specific parts would be great if possible.

I've read there are some double ferrule fittings that can do this. I've also read about EFI nylon line with push-lock. I've read about using 37° flares with an fittings, which would require me purchasing a adapter for my Eastwood flare tool. I've read about using rubber EFI hose, but I don't want to do that because I like to race at the track. I'd really like to use my existing steel feed line, and I will make a return line, but how did you guys run your lines and what kind of fittings did you use? Thanks, Rob.

[Danny Cabral]

But how do I connect the steel line to an EFI hose to the gas tank? Specific parts would be great if possible.

https://www.holley.com/products/plum...ts/AT165006ERL (Earls -6AN Male To 3/8" Tube Adapter)
https://www.holley.com/products/plum...ts/AT165106ERL (Earls -6AN Female To 3/8" Tube Adapter)
https://www.holley.com/products/plum...ts/AT165056ERL (Earls -6AN Male To 5/16" Tube Adapter)
https://www.holley.com/products/plum...ts/AT165156ERL (Earls -6AN Female To 5/16" Tube Adapter)

This is a copy & paste of one of my other posts:

Originally Posted by Danny Cabral A loud fuel pump is usually an indication of fuel pump cavitation or maybe a clogged filter(s). Inspect/troubleshoot/service the fuel system (fuel pump, cavitation, plumbing, voltage, filters, pickup tube, tank venting, etc.). A datalog will just verify a problem with the fuel pressure, injector duty cycle, pulse width, etc. An EFI fuel system needs two filters: Before fuel pump - 100 micron pre-filter. (Or the OEM in-tank sock filter.) After fuel pump - 10 micron post-filter. (40 micron is for carburetion.) The 40 micron (carburetor) fuel filter has no place on an EFI fuel system. (I know you're not using it.) It's too "fine" of a filter to be used before the pump, causing fuel pump cavitation. FYI: The sock filter (HydraMat or OEM) of an in-tank fuel pump, is the pre-filter. Don't add another one. http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart) http://documents.holley.com/flyer_ho...el_systems.pdf (Holley Fuel Systems Brochure) https://forums.holley.com/showthread...395#post223395 (Related Forum Thread - NAPA 20 Micron Pre-Filter) Contact Chris Myer at EFISystemPro.com. He's a Holley EFI parts professional, Holley EFI Dealer & fuel pump/fuel system specialist.

Originally Posted by Danny Cabral I wouldn't use a big 340 or larger LPH fuel pump with the little Sniper fuel pressure regulator. It becomes a flow/volume issue with a big fuel pump: https://aeromotiveinc.com/frequently...fi-regulators/ (Aeromotive EFI Fuel Pressure Regulator FAQs - Read Question #8, 3rd paragraph). I like the adjustable fuel pressure regulators (bypass/return style) better. Holley EFI actually makes excellent fuel pressure regulators. From Aeromotive: (FAQs - EFI Fuel Pressure Regulators): "Be careful using a factory OEM style filter-regulator, like those used in the Corvette, if your fuel pump flows more than 250 LPH. The stock part is unable to handle the excess flow provided by high flow Aeromotive fuel pumps, causing false high pressure and reduced fuel pump service life. For high performance applications, most prefer to replace the stock “returnless” fuel rail with an Aeromotive Billet Fuel Rail." Danny Cabral: Yes, the Sniper EFI fuel pressure regulator is the same type of OEM fuel pressure regulator. It's too small to support the high flow volume of an high output fuel pump. https://forums.holley.com/showthread...7746#post87746 (Related Forum Thread) https://forums.holley.com/showthread...074#post244074 (Related Forum Post)

Originally Posted by Danny Cabral Unless the in-tank fuel pump is actually a low pressure fuel pump, I'd retain it and run it solely with the Sniper EFI. Don't confuse psi ratings with what the pump is actually capable of. The psi ratings are for performance (volume) information only; they're not a pressure setting. EFI fuel pumps have a wide range of psi capability; you set the exact pressure you need/want. Electric fuel pumps only produce volume, the fuel pressure regulator creates the desired pressure. Also, any EFI fuel pump will decrease volume output (GPH flow) as fuel pressure is increased. http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart)

[RPnova]

Sorry if my post is a dumb question, too much reading on this makes my brain go dumb.
In the description it says low pressure application. Is that OK? I just don't want a fire or burst fuel every where.
I've been reading & reading about EFI hoses & stuff, and in 1 minute you tell me exactly what I need. So funny.

[Danny Cabral]

In the description it says low pressure application. Is that OK? I just don't want a fire or burst fuel every where.

Under the "Specs" tab, it states 250 Max PSI. It just can't be used for power steering, nitrous oxide, or other high pressure application.

I've been reading & reading about EFI hoses & stuff, and in 1 minute you tell me exactly what I need. So funny.

You're welcome.

[RPnova]

I swore I clicked on "Specs" and nothing happened. Oh well, the information is there.
I hate asking asking all these questions. Which adapter would you use for the EFI rubber fuel hose to connect to the above fitting? I was gonna make my return line 3/8", but 5/16" should work.

[Danny Cabral]

Which adapter would you use for the EFI rubber fuel hose to connect to the above fitting?

The above fittings are for a 5/16" or 3/8" hard fuel line to -6AN. For 5/16" or 3/8" rubber fuel hose to a -6AN fitting, use one of these:
https://www.holley.com/products/plum...ard_hose_ends/ (Earl's 5/16" & 3/8" Hose Barb To -6AN Female Only)
https://www.summitracing.com/search/...4%2B4294947311 (Summit Racing Hose Barb To -6AN Male & Female)

[RPnova]

So awesome, thank you!!! This will solve all my fitting needs, I think. Unless I need two fittings coming from the Sniper unit. I can't remember, but I think I do. But I think I have a handle on that.
Last question I promise. Is the Sniper hose in post #1 for EFI? The "Specs" is not there. I would like a steel braided hose because at the track, they say you can't have more than 12 inches of rubber hose for your car.

[Danny Cabral]

So awesome, thank you!!! This will solve all my fitting needs, I think. Unless I need two fittings coming from the Sniper unit. I can't remember, but I think I do. But I think I have a handle on that.

You're welcome. The Sniper EFI throttle body comes with two male -6AN x 9/16-18 o-ring port fittings.
http://documents.holley.com/199r11031r.pdf (Holley Sniper EFI Instruction Manual - "Fuel System Connections", Page 11)
https://forums.holley.com/showthread...8356#post88356 (Holley Sniper EFI Fuel Pressure Tester/Gauge)

Last question I promise. Is the Sniper hose in post #1 for EFI? The "Specs" is not there. I would like a steel braided hose because at the track, they say you can't have more than 12 inches of rubber hose for your car.

Yes, it's compatible with gasoline. Under the "Specs" tab, it states it's compatible with pump gasoline & race gasoline. Use the Sniper hose ends (LINK).

[RPnova]

I was more looking towards a max psi rating in the Specs tab, but thank you for all your help. And I will use those hose end links, and the other links you specified.
You really straightened me out. I know what I need to do now, and what parts I need to make my car safe and complete my fuel system. Thanks for putting up links to products and taking the time to answer my questions.

[Danny Cabral]

I was more looking towards a max psi rating in the Specs tab, but thank you for all your help. And I will use those hose end links, and the other links you specified.

I guess you'll have to contact Holley Tech Service (LINK) for that max psi specification.
http://documents.holley.com/earls_guide.pdf (Earl's Hose & Fitting Compatibility Guide)
Personally, I only use Earl's Speed-Flex or UltraPro SS PTFE (Teflon) inner lined stainless steel braided type of hose for almost everything.
https://forums.holley.com/showthread...1212#post11212 (Related Hose & Fitting Information Thread)
https://forums.holley.com/showthread...116#post224116 (-AN Hose & Fitting Assembly Advice)

You really straightened me out. I know what I need to do now, and what parts I need to make my car safe and complete my fuel system. Thanks for putting up links to products and taking the time to answer my questions.

You're welcome.

[RPnova]

I was also looking at this HOSE, which looks similar to the UltraPro line you posted.

[Danny Cabral]

No, that's not PTFE (Teflon) inner lined hose, that's just synthetic rubber hose. You don't need the UltraPro hose, the Speed-Flex hose is just as good and easier to assemble (costs less too).

[RPnova]

I see now. It's nice to have someone to talk things through with.

[Danny Cabral]

I know what you mean, and you're welcome. I've made these mistakes before.
That PTFE hose doesn't smell or permeate through the hose, compatible with any fluid, and lasts forever.
The Speed-Seal hose ends (for Speed-Flex hose only) are easy to assemble and they never leak!
Olive type (LINK/LINK) screw-on collar (reusable) fittings are the only style hose ends I use.
I only use UltraPro stainless steel braided hose when I need larger than -8AN
(my oil cooler/remote oil filter lines are -12AN), and/or I need to make a tight bend.
http://documents.holley.com/earls_guide.pdf (Earl's Hose & Fitting Compatibility Guide)
https://forums.holley.com/showthread...116#post224116 (-AN Hose & Fitting Assembly Advice)

For -8AN & smaller stainless steel braided hose:
I like Earl's Speed-Flex hose (PTFE lined) with Speed-Seal hose end fittings.
Olive type (LINK/LINK) screw-on collar (reusable) fittings are the only style hose ends I use.

For -10AN & larger stainless steel braided hose:
I like Earl's UltraPro hose with UltraPro hose end fittings.
Olive type (LINK/LINK) screw-on collar (reusable) fittings are the only style hose ends I use.

For 1/2" & larger diameter "push-on" hose:
I like Earl's Super Stock hose with the easy Super Stock hose end fittings.
https://www.holley.com/products/fuel...l_system_kits/ (Holley EFI Super Stock 20' Fuel System Kits)

For 5/16" & 3/8" EFI "push-on" fuel hose:
I like Earl's Vapor Guard hose with the easy Vapor Guard hose end fittings.
https://www.holley.com/brands/holley...l_system_kits/ (Holley EFI Vapor Guard 20' or 40' Fuel System Kits)

[RPnova]

Great information and it looks like the Speed Seal hose ends come with the olive, according to the specs (Hose Ends). This is what I'll use, along with the Speed Flex hose.