EFI fuel line - Team Camaro Tech
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post #1 of 12 (permalink) Old Sep 27th, 10, 03:00 PM Thread Starter
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Dan
 
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EFI fuel line

I am getting ready to start my efi install. I have a 3/8's s.s hardline now for my carb set up that I am planning to use as the return line.
I have a 1/2 s.s. premade hardline I purchased at a swap meet a while back. It is an exact replica of the 3/8's line. Because my car in finished there is no way to install the new 1/2 line beside it without cutting it once maybe twice to fit and sit nicely beside the original line.
What would you do,
Forget about the hardline and just buy/run 1/2 fuel hose?
Downside, mainly just appearance in my opinion
Or use a combination of hardline and hose for a neater look.
The downside would be the extra connections which create a possible place for a leak I guess.

67 RS convertible
Mark Jones 496...690hp
Liberty modified TKO600
Holley HP EFI
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post #2 of 12 (permalink) Old Sep 27th, 10, 03:35 PM
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Re: EFI fuel line

If you have 1/2 line made, use it. Buy 3/8 aluminum and bend it to fit along side.

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post #3 of 12 (permalink) Old Sep 28th, 10, 12:56 AM
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Steiner
 
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Re: EFI fuel line

The existing 3/8" ought to be plenty if you're going to use it as the return line. That's what I did. For the supply line, I used teflon flex line mounted along the hard line. You'd need -8 at a minimum I reckon, maybe -10.

Since my pump has to be mounted at the bottom edge of the fuel tank to prime, using the hard line as the send line wasn't really an option unless I wanted to cut off the section going up the rear frame rail.




'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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post #4 of 12 (permalink) Old Sep 28th, 10, 04:31 AM
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Re: EFI fuel line

Dont need 1/2", which is tough to fit. I'm running 3/8" with my beast.

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69 CHEVELLE SS
502 EFI/[224/228 HR]/T56/3.90
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post #5 of 12 (permalink) Old Sep 28th, 10, 06:34 AM
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Re: EFI fuel line

At 690HP in your signature, you need 1/2". NO HOSE, the high pressure of fuel injection will permeate fuel smell like crazy, you will have to move out of your house the garage will smell so bad. Been there done that. IF you cannot lower the subframe to snake the line through, I would find someplace I could cut the line, and then flare and reconnect the line with steel female tube nuts and sleeves with a -8 male / male adapter.

You probably do not have a 1/2 flare kit, most do not, your local hydraulic shop can most likely flare the tube and supply the steel fittings to reconnect.

Just make sure wherever the reconnection is, there is room for the bulge of the fittings. this way you will have a safe, none smelly fuel system.

BTW, if you do this right, you could put the fuel filter at the cut and reconnect.
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post #6 of 12 (permalink) Old Sep 28th, 10, 06:48 AM
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Re: EFI fuel line

You realize Frank that EFI doesnt need as large a line right = higher pressure, less volume.

VINCE
69 CHEVELLE SS
502 EFI/[224/228 HR]/T56/3.90
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post #7 of 12 (permalink) Old Sep 28th, 10, 07:32 AM Thread Starter
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Re: EFI fuel line

I started installing the 1/2 s.s. line last nite. It is putting up a bit of a fight.I have decided to cut the 1/2 s.s. line just in front of the rear wheel by the front of the spring hanger. I have Areoquip versi flareless tube adapters and will use them for putting the an fittings on the ends and for the union in the middle. I have cut 18 inches off of the front and rebent it toward the bell housing where I will go to hose. I have black Areoquip starlite hose? I got at a swap meet. I will try it. I know teflon is the action but it is pricey and I got this so I got to try it. The existing 3/8's will be the return.

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post #8 of 12 (permalink) Old Sep 28th, 10, 11:46 AM
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Steiner
 
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Re: EFI fuel line

Quote:
Originally Posted by ProdigyCustoms View Post
NO HOSE, the high pressure of fuel injection will permeate fuel smell like crazy, you will have to move out of your house the garage will smell so bad. Been there done that.

Teflon HOSE is what eliminates that issue. Just like what modern cars use.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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post #9 of 12 (permalink) Old Sep 28th, 10, 12:11 PM
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Re: EFI fuel line

How about the pass throughs they use on some hot rods They have male fittings on both ends. They come in different lenghts. I'm no expert but just a thought.

Wayne
69 Camaro SS/RS. Fab 9. GM LSA/485 crate drive train. . C6 Z51 brakes. AirRide G bar Rushforths 18x8 19x12

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post #10 of 12 (permalink) Old Sep 28th, 10, 12:29 PM Thread Starter
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Re: EFI fuel line

"If" you guys talk me into buying more hose (teflon), can I use my existing fittings or do I have to use specific fittings for teflon?

67 RS convertible
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Holley HP EFI
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post #11 of 12 (permalink) Old Sep 28th, 10, 07:10 PM
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Re: EFI fuel line

Quote:
Originally Posted by SIDEWAYS View Post
You realize Frank that EFI doesnt need as large a line right = higher pressure, less volume.
Yeah, but not at 700HP. We do a lot of injection, 600HP on 3/8, no worries, 650HP we move up to 1/2". Lean is death. Me no run that risk.
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post #12 of 12 (permalink) Old Sep 28th, 10, 07:12 PM
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Frank
 
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Re: EFI fuel line

Quote:
Originally Posted by Steiner View Post
Teflon HOSE is what eliminates that issue. Just like what modern cars use.
If you have to use a short stretch, yes teflon is the way to go. We hard line front to back if we can get enough wiggle room at the engine side.

No your regular AN fitting will not work with teflon.
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