Holley sniper guys! Install question
Thread Starter
Instructor
Joined: Jan 2018
Posts: 229
Likes: 31
From: Finger Lakes area NY
Holley sniper guys! Install question
Fuel lines
holley says 3/8 ID supply.
The original line is 3/8 OD
i am unable to find 3/8ID steel line.
has anyone used the stock line for supply?
running 3/8 fuel hose from the tank to engine will be a real pain in the a#%
holley says 3/8 ID supply.
The original line is 3/8 OD
i am unable to find 3/8ID steel line.
has anyone used the stock line for supply?
running 3/8 fuel hose from the tank to engine will be a real pain in the a#%
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Here you go. Use as little rubber as possible. Actually try to use no rubber. Get fitting a real fuel line capable of more pressure. I have always used PTFE which is teflon liner hose. This is capable or running todays fuels with ethanol in them. Rubber lines will deteriorate over time with alcohol based fuels. Use as much steel as possible. Ihave done this many times wit hthe stock 3/8 lines. These should support up to 600Hp with a proper fuel pump.
https://www.zip-corvette.com/70-74-g...rame-line.html
https://www.zip-corvette.com/70-74-g...rame-line.html
Thread Starter
Instructor
Joined: Jan 2018
Posts: 229
Likes: 31
From: Finger Lakes area NY
I purchased the Holley Gas tank with 255 LPH internal pump.
https://www.holley.com/products/fuel...s/parts/19-148
Holley says to run 3/8 ID fuel line. I have around 40' of Earls Vapor guard high pressure gas line but would prefer steel.
Will the Holley 255 pump handle aprox 430HP 427 through 3/8" OD line The inside diameter of that line is well below Holley's spec.
I just don't want to get it all done and have fuel pressure or volume issues.....
https://www.holley.com/products/fuel...s/parts/19-148
Holley says to run 3/8 ID fuel line. I have around 40' of Earls Vapor guard high pressure gas line but would prefer steel.
Will the Holley 255 pump handle aprox 430HP 427 through 3/8" OD line The inside diameter of that line is well below Holley's spec.
I just don't want to get it all done and have fuel pressure or volume issues.....
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
I'm in the same boat as you. I never did find out if our 3/8" OD supply lines are sufficient for a system that calls for a 3/8" ID line but I suspect it's close enough.
I'm planning a new fuel system for an Edelbrock Pro-Flo 4 XT EFI setup on my '73. After taking a hard look at the existing supply line, I realized the previous owner had installed the line in three pieces so I had two splice junctions to contend with. Decided I didn't like having those extra fittings given the higher pressures of an EFI system. I ended up purchasing a hose kit from Tanks Inc. They claim the hose is compatible with all hydrocarbon and all alcohol based fuels. I'd rather have a metal line but it looks like you have to separate the body from the frame to install a new line.
DC
Last edited by DC3; Mar 5, 2020 at 05:20 PM.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
I purchased the Holley Gas tank with 255 LPH internal pump.
https://www.holley.com/products/fuel...s/parts/19-148
Holley says to run 3/8 ID fuel line. I have around 40' of Earls Vapor guard high pressure gas line but would prefer steel.
Will the Holley 255 pump handle aprox 430HP 427 through 3/8" OD line The inside diameter of that line is well below Holley's spec.
I just don't want to get it all done and have fuel pressure or volume issues.....
https://www.holley.com/products/fuel...s/parts/19-148
Holley says to run 3/8 ID fuel line. I have around 40' of Earls Vapor guard high pressure gas line but would prefer steel.
Will the Holley 255 pump handle aprox 430HP 427 through 3/8" OD line The inside diameter of that line is well below Holley's spec.
I just don't want to get it all done and have fuel pressure or volume issues.....
Jebby
Le Mans Master
Joined: Nov 2016
Posts: 9,264
Likes: 951
From: Lake Tahoe, CA
********NOTE #1 CONNECTING LINES *********
DANGER! Rigid fuel line tubing should be used for under vehicle runs, such as along vehicle frame rails or under floor pans. Failure to do so is a potential fire or explosion hazard, which could cause serious injury or death
DANGER! Rigid fuel line tubing should be used for under vehicle runs, such as along vehicle frame rails or under floor pans. Failure to do so is a potential fire or explosion hazard, which could cause serious injury or death
- If using steel line, the hose (Item 2) can be used to connect the steel line to the pump and filters. You should not connect a rubber hose directly to a steel line unless the end of the line has a “bead/nipple” or barb that retains the hose. If the steel line is just cut off, purchase a compression fitting that a barbed hose end can be installed on, or use a tool to roll a bead/nipple on the end of the steel line.
- If you plan to install a fuel pressure gauge, do so at this time. The Sniper EFI systems are designed for an operating pressure of 58.5 PSI. Although this is factory pre-set, it is ideal that it be checked.
- If using the existing fuel lines, inspect and replace any hose, clamps, or fuel line showing ANY sign of aging.
- Anchor all fuel lines securely to solid chassis members at 1 1⁄2 foot intervals using rubber coated steel clamps (not supplied). Use of only approved steel fuel line tubing will afford maximum fuel line protection against road hazards and premature wearing due to flexing, temperature extremes, road salt, weather, etc.
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Verdad Gallardo
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
If you are going to be replacing your fuel line from front to back with new, here is a good place to buy any metal in almost any size ID/OD. I have bought from them lots of times with no issues. I would go with stainless myself, but that's just me.
Metal Supplier
Metal Supplier
Advanced
Joined: Jun 2017
Posts: 61
Likes: 2
From: minneapolis mn
the original 3/8" steel line flows enough fuel for L88's and more. 3/8" NiCopp is suitable for fuel line. check the specs and you will see it is far stronger than anything your car will ever see. sniper needs 58.5 psi and NiCopp is 20 can tolerate times that or more. 2 bonuses: 58% easier than steel to bend, resistance to corrosion.
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
the original 3/8" steel line flows enough fuel for L88's and more. 3/8" NiCopp is suitable for fuel line. check the specs and you will see it is far stronger than anything your car will ever see. sniper needs 58.5 psi and NiCopp is 20 can tolerate times that or more. 2 bonuses: 58% easier than steel to bend, resistance to corrosion.
I'm liking what I've read about copper-nickel tubing. Most European car manufacturers have been using it for brake lines since the 70's. The US DOT has approved it for use in brake systems. The tubing manufacturers state that the tubing is approved for use in fuel systems and for transmission lines. The only drawback I've found so far is that it is softer than other metal tubing and some are recommending the use of the stainless spiral protectors on the tubing in vulnerable areas. The burst pressure on the copper-nickel tubing is comparable to other metal tubing and is way higher than it will ever see in an EFI application.
If you get a copy of Lars' fuel line paper, you'll find you can use 45 degree flares and AN fittings (tube nuts and sleeves) with fuel line tubing reliably at pressures up to 250 PSI.
DC
Advanced
Joined: Jun 2017
Posts: 61
Likes: 2
From: minneapolis mn
i used some NiCopp yesterday in my 65/66 corvette. i ran it from the battery box area back to the tank area. i will be using it to protect a wire for the electric fuel pump for my sniper project. it will serve double duty as a ground for the fuel pump and fuel sender. while somewhat more flexible than steel, it is VERY TOUGH stuff. i can't imagine any rock kicked up would cause it any harm. i will take a hammer to a sample today and compare it to steel.
i am using the original steel line for fuel to my sniper...no return line needed. i will be using NiCopp in the engine area to the throttle body.
i am using the original steel line for fuel to my sniper...no return line needed. i will be using NiCopp in the engine area to the throttle body.
Advanced
Joined: Jun 2017
Posts: 61
Likes: 2
From: minneapolis mn
i don't think it is a good idea to use 45 degree flares for an fittings as they are 37 degree. i plan to use a 37 degree flare tool i got on ebay for 5 bucks. single flares, not double. tube and sleeve an fittings.
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
Lars is an aerospace engineer. He has personally tested 45 degree single flares with AN fittings and says the combo is good for 250 PSI. But, I agree that 37 would be better especially since the 37 degree flaring tools are reasonably priced.
DC