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2/06/2017 6:08 PM  #1


efi conversion - connection to fox body fuel rail extensions

hello all,

love the forum.  i have an 68 fastback where i am installing an 89 fox body engine.  As you all know the motor has the fuel rails on the intake manifold then the fuel rail extensions plug into that and route the fuel lines behind the alternator.  My question is how connect to the fuel rail extension section where it ends below the alternator?  I thought it would be same as fuel rail on the intake as i see the quick disconnect connectors but instead the engine side has the male portion where i was expecting the female portion of the quick dis connect fittings.  

 

2/07/2017 9:23 AM  #2


Re: efi conversion - connection to fox body fuel rail extensions

The fuel fittings on an EFI Fox body car are Spring Lock fittings.  At the connection between the engine fuel lines and the fuel lines on the body the female (cup side) of the fittings is on the fuel lines on the body. 

So here's your problem, you need both a 5/16" and 1/4" female spring lock to connect the engine fuel lines to the fuel lines from the tank to the engine fuel lines.  The 5/16" fitting is readily available, and even available as an adapter fitting to connect directly to -6 AN.

The issue is the 1/4" fitting, which is not reproduced.  Mustangs Unlimited used to sell them, but they are listed as NLA on their website now.  I tracked them down to Ron Morrison (who was MU's supplier), and actually emailed with Ron to discover that the supplier that made them no longer produces them. 

At this point your option is pretty much junkyard.  I will say that the return lines on the V8 cars were 1/4" and I beleive the supply lines on 2.3 cars were also 1/4", so it shouldn't be that hard to find. 

 

2/07/2017 5:07 PM  #3


Re: efi conversion - connection to fox body fuel rail extensions

TKOperformance, thanks for the response.

i have both fittings.  I will remove the fox body plastic line and re-use them.  Currently, they have about 6 inches of old fox body line on them but i will simply remove with razor.

thanks again.

     Thread Starter
 

2/08/2017 5:24 AM  #4


Re: efi conversion - connection to fox body fuel rail extensions

When you reuse the fittings you can just connect them to 1/4" or 5/16" rubber fuel line and then on to new hardlines to the tank.  You could probably use worm drive clamps to secure them, but I prefer Oetiker clamps like these:

https://www.oetiker.com/en/Products#/?l0=A7D278F8664B424DA07D0E74E96A6B8A&l1=857A6B4A67774216A3AAE58752B204A9&l2=FB521EC93BE240B590F0358FEC73F269

The 153/154 and 101/151 are the series you would want to use.  Not expensive at all and should be available at your local NAPA.  If not then a local hydraulic shop will definitely have them. 

 

2/08/2017 8:22 AM  #5


Re: efi conversion - connection to fox body fuel rail extensions

For EFI fuel lines I would prefer to use inverted flare, or even compression fittings to adapt the steel Fox line to nylon (for some flex), then back to steel for the main source and return lines.  The only neoprene hose I used is between the tank and the pump...and I check that often.


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

2/08/2017 9:58 AM  #6


Re: efi conversion - connection to fox body fuel rail extensions

BB, I too like the Nylon, but the aftermarket fuel lines for my Fox don't have the correct barbs for using the Nylon.  The Nylon line should go on metal line that has three barbs right in a row.  I think that's how they got away with not having to clamp or crimp them in any way.  I suppose I could cut and flare the hard line and then go from inverted flare to hose barb, but I don't really have the right tools to flare stainless.  I've used a standard flare tool on 3/16" stainless brake lines before, but I've broken a lot of dies doing that too.  I wouldn't even try it on 1/4" let alone 5/16"; its just too hard.

Now if you're making up your own lines anyway the Nylon is definitely a better choice than rubber.  I'll just have to keep an eye on the rubber sections with plans to replace them every 10-15 years. 

I'd really like to get a good flare tool that can handle the stainless, but all the ones I've seen are like $300, and I just can't justify it yet. 

 

2/08/2017 7:24 PM  #7


Re: efi conversion - connection to fox body fuel rail extensions

I just bought the Eastwood armstrong flaring tool.  Its supposed to do any tubing, including stainless.  Haven't tried stainless but it does a  beautiful job on everything else.  $189 on sale.

BB


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

2/08/2017 8:04 PM  #8


Re: efi conversion - connection to fox body fuel rail extensions

Okay, cool, and thanks.  Eastwood was probably who I was going to buy from anyway, but the reviews seemed spotty.  I trust you more than a bunch of people I've never seen or heard and don't know what level of competence they have.  Reviews are good, but like anything else you've got to consider the source.  A thumbs up from you is worth two dozen mixed reviews in my book. 

 

2/09/2017 12:18 PM  #9


Re: efi conversion - connection to fox body fuel rail extensions

I prefer the nylon line also. I harvested all my fitting from the local PandP.
This link is useful:
http://ls1tech.com/forums/fueling-injection/1085884-nylon-fuel-line-fitting-attachment.html

See Step 19 for installing fitting. But I heated the end of the tubing in boiling water for no more than 2 minutes (per Ford) to slightly soften and make the install a bit easier.

Bought the nylon tubing from McMaster-Carr many years ago but looks now to be readily available.
I also covered the tubing in that old school tar covered cloth wire harness loom for protection.

 

2/10/2017 8:17 AM  #10


Re: efi conversion - connection to fox body fuel rail extensions

Oh Poncho, that guy is brilliant.  I used the flairing clamp to push mine onto the fitting with the fitting held in the vice...worked okay.  But his idea to use the calking gun....absolutely brilliant.  Thanks very much.

BB


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

Board footera


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