5/16 hardline to -6 an

[badandy]

Okay guys...need some help. Most major manufacturers of an stuff do not make a 5/16 tube nut which would equate to a -5 if such a rascal existed (which it doesn't). I really don't want to upgrade my fuel lines just yet (I have 5/16 feed and return).

So...I found this after I did some searching:
http://www.034motorsport.com/product_info.php?products_id=130

Now...on to my question. It says no flaring, just cut and slide the sleeve over and assemble. I would think this would be fine for low fuel pressure...like carb'd applications...but I can't see how this would work with high pressure fuel setups like ours.

Any suggestions?

[cordes]

Earls -6 AN Male to 5/16" Tubing Adapter Jegs PN: 361-165056 Price: 11.99

I did not even have to search for that as I just posted it up in another thread. I have used it on my omni with no flaring at the fitting end. There are a couple of pictures of it on my site. I will try and link to a couple of them in a minute.

ETA: Here is a link to the page, http://www.omniglht.com/rail.html

You can see the fitting connected to the rubber line that ends up going across the FP gauge.

http://www.omniglht.com/rail/tofpr.jpg

http://www.omniglht.com/rail/lines.jpg

[Clay]

we have -5 line and fittings at work, so its not that uncommon.

as for the nut/ferrule setup, I dont have any issues with it. We run hydraulic systems at 4000 psi with that style of fitting and no issues. ;)

[iTurbo]

I've used these on my Spirit R/T for the last 25k miles or so without a problem at all:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D2200077B&N=700+4294924496+4294839052+4294847275+4294906726+ 4294901859+115&autoview=sku

I modified my fuel tank sending unit for 3/8" tube in/out and use the AN-to-tube adapters to attach the 6AN hose. They use a brass ferule inside and form a compression seal around the outer surface of the tube.

[gasketmaster]

I removed my fuel line and had a steel -6 male fitting soldered to the line by my radiator shop.......it's never coming off or leaking ;)

[iTurbo]

Found a pic:

http://www.turbosedan.com/spirit/DSC02790.JPG

They've never leaked so I would try them Andy. Back when I was redoing the fuel system on my Spirit R/T, I had considered using that 5/16"-6AN tube-to-AN fitting since it was the only way I could find to adapt it to the factory feed line, but then I just decided to run new 3/8 hardline for feed/return.

[badandy]

I called the place I linked and they said no problems with their applications either. I had called Jegs and the guy I got told me it wasn't possible to adapt 5/16 to AN but I knew better. Thanks for the info/help guys:thumb:

[badandy]

Earls -6 AN Male to 5/16" Tubing Adapter Jegs PN: 361-165056 Price: 11.99

I did not even have to search for that as I just posted it up in another thread. I have used it on my omni with no flaring at the fitting end. There are a couple of pictures of it on my site. I will try and link to a couple of them in a minute.

ETA: Here is a link to the page, http://www.omniglht.com/rail.html

You can see the fitting connected to the rubber line that ends up going across the FP gauge.

http://www.omniglht.com/rail/tofpr.jpg

http://www.omniglht.com/rail/lines.jpg

I just looked these up and see they have a rating of 50 psi max. Our fuel pressure exceeds that by quite a bit. It's exactly what I was looking for when I called Jegs but maybe the guy I spoke with didn't recommend these to me because of the low pressure threshold? Evidently they are working for you just fine but I don't want to have a fuel leak and a resulting fire.

[badandy]

Found a pic:

http://www.turbosedan.com/spirit/DSC02790.JPG

They've never leaked so I would try them Andy. Back when I was redoing the fuel system on my Spirit R/T, I had considered using that 5/16"-6AN tube-to-AN fitting since it was the only way I could find to adapt it to the factory feed line, but then I just decided to run new 3/8 hardline for feed/return.
That's kick azz! One of these days that's exactly what I'm going to do!

[cordes]

I just looked these up and see they have a rating of 50 psi max. Our fuel pressure exceeds that by quite a bit. It's exactly what I was looking for when I called Jegs but maybe the guy I spoke with didn't recommend these to me because of the low pressure threshold? Evidently they are working for you just fine but I don't want to have a fuel leak and a resulting fire.

That is somewhat perplexing since the tech I was talking with was looking in the brake section when he found them for me. :confused2:

I will see if I can find the specs for this particular part on the companies website. Thanks for the heads up.

[Clay]

Found a pic:

http://www.turbosedan.com/spirit/DSC02790.JPG

They've never leaked so I would try them Andy. Back when I was redoing the fuel system on my Spirit R/T, I had considered using that 5/16"-6AN tube-to-AN fitting since it was the only way I could find to adapt it to the factory feed line, but then I just decided to run new 3/8 hardline for feed/return.

when you did this, did you use the original lines on the fuel pump, or did you some how adapt bigger lines?

thanks,
clay

[badandy]

That is somewhat perplexing since the tech I was talking with was looking in the brake section when he found them for me. :confused2:

I will see if I can find the specs for this particular part on the companies website. Thanks for the heads up.
Let me know what you find out. I think it's a misprint being as the same product that I linked was rated to something like 300 or 400 psi.

[cordes]

I have contacted Holly directly, and they will supposedly get back to me in 48 hrs. I will update this thread when I hear back from them.

[Clay]

why didnt you just call summit?

:)

[cordes]

why didnt you just call summit?

:)

You guys just think that is hilarious don't you. :p

[WVRampage]

I ordered one today so I can hook up the fuel on mine when I go 16 valves.

[crazymadbastard]

I used one of those on my 5/16 feeds to -6 AN, I cut a bit off the collar so that it could slip on the factory feed line a bit more.(the quick connect hump did not allow it to fit into it enough to make me confortable)
I have about 1000 miles on mine with no leaks.

[cordes]

I used one of those on my 5/16 feeds to -6 AN, I cut a bit off the collar so that it could slip on the factory feed line a bit more.(the quick connect hump did not allow it to fit into it enough to make me confortable)
I have about 1000 miles on mine with no leaks.

I will say that I put over 1300MI on mine in December alone, and it did not leak. I probably have about 2K miles on it now.

[badandy]

I will say that I put over 1300MI on mine in December alone, and it did not leak. I probably have about 2K miles on it now.
What do you think is the highest fuel pressure you have reached?

[cordes]

What do you think is the highest fuel pressure you have reached?

I am willing to bet that I have not reached more than about 68PSI so far with that fitting on there thus far. 70PSI a time or two tops.

ETA: I am now tempted to pinch off the return line to see what it will hold in the real world. I am surprised that I have not heard back from Holley now that I think of it too.

[badandy]

I am willing to bet that I have not reached more than about 68PSI so far with that fitting on there thus far. 70PSI a time or two tops.

ETA: I am now tempted to pinch off the return line to see what it will hold in the real world. I am surprised that I have not heard back from Holley now that I think of it too.
I think it's all good Cordes...now if I could just find that damn fitting to adapt my TU fuel Rail to my TU piggyback regulator adapter I would be in good shape!

[iTurbo]

when you did this, did you use the original lines on the fuel pump, or did you some how adapt bigger lines?

thanks,
clay

Just for reference, the sending unit pictured is originally from my '91 R/T. The supply/return are on the same unit. The supply tube starts off as 3/8" on the inside, and then necks down to 5/16" with a quick disconnect connection on the outside. I used my dremel to cut off the 5/16" portion and then had 3/8" steel tube brazed on so it's now entirely 3/8". The return tube was 1/4" and I cut off/drilled it out entirely and had a 3/8" steel tube brazed in. Then I used the aforementioned AN-to-tube adpaters to provide a 6an connection. The molded plastic electrical connector for the fuel pump is easily removed from the flange so it was not damaged during the brazing.

Here is a picture of the sending unit flange with the electrical connector and fuel pump removed:

http://www.turbosedan.com/spirit/DSC02760.JPG

http://www.turbosedan.com/spirit/DSC02761.JPG

http://www.turbosedan.com/spirit/DSC02763.JPG

Here is where the 3/8" portion necks down to 5/16":

http://www.turbosedan.com/spirit/DSC02762.JPG

Here it is with the return tube removed and 5/16" portion of the supply tube cut off:

http://www.turbosedan.com/spirit/DSC02767.JPG

http://www.turbosedan.com/spirit/DSC02768.JPG

Here is another picture showing the new 3/8" tubes:

http://www.turbosedan.com/spirit/DSC02791.JPG

The return tube was a little tricky because the fuel pump is spring loaded against it so the pickup sock stays planted at the bottom of the tank. The original fuel return tube used a plastic retainer on the end for the spring to load against. With the new 3/8" tube, this wasn't possible, so I flared the end so the spring still works as it should. My R/T is now entirely void of hose clamps or QD fittings and I've never had a leak since. The fuel pump is a Walbro 255 ltr/hr pump from FWDP and was a 100% drop in replacement for the original pump.

http://www.turbosedan.com/spirit/DSC02773.JPG

[t3rse]

i flared the pipe and used a flare fitting with some adapters to get to -6. i used a lot of fittings to get it there, but it worked and i've never had a problem.