1/2" Inline Tube Hard Line Install help - Chevelle Tech
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post #1 of 11 (permalink) Old Sep 9th, 18, 12:48 PM Thread Starter
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1/2" Inline Tube Hard Line Install help

I'm in the process of working out my fuel lines on my '67 and am trying to install the 1/2" inline tube hard line but am having problems getting it run through the front of the frame. It gets so far and just doesn't want to go. My intent is to run a 1/2" fuel and a 3/8" return. I was able to get the 3/8" right up to the front hole but pulled it back out because I figured the 1/2" line needed to go through first since it seams to be the toughest.

Has anyone else done this or just installed the 1/2" hard line and do you have any tricks that worked for getting the line or lines through the frame?

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post #2 of 11 (permalink) Old Sep 9th, 18, 1:26 PM
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Re: 1/2" Inline Tube Hard Line Install help

Have you tried running a fish tape from the front and taping it to the line with a taper at the transition then doing a push/pull?

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post #3 of 11 (permalink) Old Sep 9th, 18, 1:58 PM Thread Starter
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Re: 1/2" Inline Tube Hard Line Install help

Tom, I haven't tried that. The problem is the 1/2" line isn't very flexible.

I was looking at the car and since I just have the front suspension mocked up I was thinking I could take the RH side apart which would give me access through the spring pocket to the inside of the frame rail. I may try that as my next step. I'll need to take the fuel lines back apart since right now I'm still mocking things up. I figured the first step was to get them in without modifications so I could see how everything lays out.

Some of the the things I need to do are:
- install a 10 micron filter somewhere in the 1/2" line (I am looking at putting in front of the RH rear end lower control arm mount on the frame since it's a nice flat spot with some height or maybe on the coil over bar at the back)
- cut the end up front to clear the A/C compressor and convert them to AN fittings. (I am planning on running a fuel pressure regulator mounted to the RH head)
- figure out where I'm going to position the rear of the lines since I'm running mini tubs and have a modified frame and a coil over mount bar running across the top.

If anyone has done a similar project and has some pics on how they addressed these items that would be much appreciated. Just doing my R&D (rip-off and duplicate).

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post #4 of 11 (permalink) Old Sep 9th, 18, 2:03 PM
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Re: 1/2" Inline Tube Hard Line Install help

from the front of the frame It helps to pull a rubber hose back through to guide the new line back up through the frame. I loosened all of the body bolts on driver side pulled out the frame bolts on the passenger side. Then separated the body until the rear valence hit the back cross member. I fished the line in from the back wheel well. I did outline it several years ago it may still be around.
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post #5 of 11 (permalink) Old Sep 9th, 18, 2:41 PM Thread Starter
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Re: 1/2" Inline Tube Hard Line Install help

Quote:
Originally Posted by aukai View Post
from the front of the frame It helps to pull a rubber hose back through to guide the new line back up through the frame. I loosened all of the body bolts on driver side pulled out the frame bolts on the passenger side. Then separated the body until the rear valence hit the back cross member. I fished the line in from the back wheel well. I did outline it several years ago it may still be around.
Mike, I looked through your posts but couldn't find an outline. I have the body off so access isn't the issue. Like you said in one of your posts there's a few tight spots fishing it through and that appears to be where I'm at. I tried different angles and twists but just can't get it to move once I get to a certain point. Maybe I'll see if I have some rubber hose or like Tom said try using an electrical fish line to pull and push before I pull the front suspension apart.

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post #6 of 11 (permalink) Old Sep 9th, 18, 2:53 PM
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Re: 1/2" Inline Tube Hard Line Install help

If you can get the rubber hose back through, you can wrap some line tightly to keep if from slipping off, then there is nothing to hang up on.

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post #7 of 11 (permalink) Old Sep 9th, 18, 10:54 PM
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Re: 1/2" Inline Tube Hard Line Install help

Quote:
Originally Posted by aukai View Post
If you can get the rubber hose back through, you can wrap some line tightly to keep if from slipping off, then there is nothing to hang up on.
I had zero problems fishing a 1/2" stainless fuel line through the frame using this method fwiw. Worked like a charm!

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post #8 of 11 (permalink) Old Sep 10th, 18, 2:18 AM
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Re: 1/2" Inline Tube Hard Line Install help

I just did this on my 69, also body off the frame. The front literally fell in place, rear part wasn't bent quite so well. I used a summit filter #SUM-230116-B with 2 summit adapters #SUM-2200076B inside the frame just behind where the line makes the outward jog at the middle clamp.


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post #9 of 11 (permalink) Old Sep 10th, 18, 5:39 AM
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Re: 1/2" Inline Tube Hard Line Install help

Yeah, good luck trying to get it through the frame hump over the diff......
I gave up.

I used 1/2" rubber hose, easy to work with, been there over 10 years now. If your fuel system is going to use a bypass regulator, the return line should have a larger ID, not smaller.
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post #10 of 11 (permalink) Old Sep 10th, 18, 9:49 AM Thread Starter
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Re: 1/2" Inline Tube Hard Line Install help

Quote:
Originally Posted by Gtogeoff View Post
If your fuel system is going to use a bypass regulator, the return line should have a larger ID, not smaller.
I originally thought the feed and return needed to be the same size but the Aeromotive EFI bypass regulator I'm planning on using has -8 AN inlet/outlet ports and a -6 AN return port. Based on a Feulab article and some other posts I read, since EFI requires higher fuel pressure the smaller return line doesn't impact fuel pressure on an EFI system like it does a carb system. Given this I'm matching the feed/return lines to the regulator port sizes.

Regulator
https://www.aeromotiveinc.com/produc...ulator-orb-08/

Article on fuel line size for EFI
(Fuelab - Back in the early days of aftermarket EFI systems, the great veterans of carbureted fuel delivery systems would scoff at running a small EFI return fuel line saying “It will never work!” They would also look at the much smaller return orifice in the EFI regulator and say “It will not flow enough!” What they did not know was that Carbureted and EFI systems operate differently because of sensitivity to pressure drop.)

Fuel Line Size vs. Pressure Drop | Fuelab

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post #11 of 11 (permalink) Old Sep 10th, 18, 12:03 PM
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Re: 1/2" Inline Tube Hard Line Install help

Quote:
Originally Posted by rpol78 View Post
I originally thought the feed and return needed to be the same size but the Aeromotive EFI bypass regulator I'm planning on using has -8 AN inlet/outlet ports and a -6 AN return port. Based on a Feulab article and some other posts I read, since EFI requires higher fuel pressure the smaller return line doesn't impact fuel pressure on an EFI system like it does a carb system. Given this I'm matching the feed/return lines to the regulator port sizes.

Regulator
https://www.aeromotiveinc.com/produc...ulator-orb-08/

Article on fuel line size for EFI
(Fuelab - Back in the early days of aftermarket EFI systems, the great veterans of carbureted fuel delivery systems would scoff at running a small EFI return fuel line saying “It will never work!” They would also look at the much smaller return orifice in the EFI regulator and say “It will not flow enough!” What they did not know was that Carbureted and EFI systems operate differently because of sensitivity to pressure drop.)

Fuel Line Size vs. Pressure Drop | Fuelab
Just check your return line pressure. If it's ever more than 3psi, it needs to be bigger. Preferably zero.

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