Hi All, had 2 quick questions. I am currently upgrading my fuel system and am staring with running stainless hose and AN fittings from my 3/8 hard line to the carb.

anyway

1) I currently have 3/8 hard line and amd Running -8 AN from there to the carb. (Thinking that down the road I will get rid of the hard line and run -8 AN all the way back). Just wondering how do I make the connection from -8 AN to the 3/8 hardline. From what I understand -8 AN is around 1/2 inch.

2) In general are there any tips or techniques when Installing AN fittings?

Thanks
Chris

1.) Yes its is fairly close.

2.) You need a -08AN Male to 3/8''NPT Male Adapter http://www.jegs.com/images/photos/799660461.jpgusually $10.00 or less.

3.) Patience... :D and A friend to help. ;)

Lets see if I can help.I have stainless steel 3/8 line there is an 6an for stainless steel line it slides over the line you flare it and then add the male end Jegs and summitt carry it.Then you have to put an 6an female to 8an male adapter to the fuel line to carb.This works for me sorry no pictures at this time.

Chris, I'm redoing my fuel system at the moment. In an effort to change the weight bias of the car, and make it easier to work on at the track.

A 1/2" line is big, it's going to make the pump work harder, since it needs to push a 1/2" column of fuel to the front of the car, unnessicarily.

For the smaller pumps, like the Holley Blue or Mallory 140 you're better off with a 3/8" line and 6an hose to a dead-head style regulator.

My newest system consists of a 5 Gallon fuel cell, Trunk Mounted Mallory 140 with 8an hose feeding the pump (through a high flow filter), then it passes through another 8an filter before stepping down to 3/8" Stainless tubing (with a Russell tubing adapter on it) to the front of the car where i have a 6an hose going to the regulator.

At the Carb i'm installing a Magnafuel regulator.

The reasons i'm doing this are:

-If my car ever needs a serious fuel system, i can install a Magnafuel pump. All Magnafuel and Product engineering pumps have a return built into the pump. So to run the return line it goes the short trip from the pump to the cell in 5ft of hose.

-The 6an fittings from the regulator to the carb are what ProStock teams are using, if its large enough for them, its more then capable of anything i'll ever need to feed in this car.

-The returnline less system (or the short return from tank to pump) is lighter overall.

So my system is capable of feeding this motor well into the bottom 10's, and inexpensively upgradable to be capable of feeding a much quicker engine.

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1011440.jpg

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1011439.jpg

I used the same 3/8 - 6AN fitting from Jegs that FastFred talked about part #799-639210 or 639200 depends if you want male or female fitting. It worked great. Added new ss hose to the fuel pump on up to the carb. I believe they suggest using a light weight oil such as WD40 on the threads. Eight AN seems pretty fat to me IMO.

Another option is to use a 3/8 hardline to -6 male or female AN compression fitting. Earls makes both versions and are good for most low-pressure applications. I run one and it works fine.

Flaring the end of your hardline and using an AN nut and ferrule is the best but may be difficult to do if the line is in the car and is the stock soft steel version. Soft steel lines, even low-pressure applications, should be double flared. Stock lines from the pump to the carburetor are double-flared. If the hardline is stainless it can be single flared. Be sure to use the 37* flaring tool and not the standard SAE 45*.

Both Aeroquip and Earls catalogs have good installation sections that will help. Also, -6AN fittings neck-down usually to 1/4" or less. This fitting neck-down is something to consider when it comes time to add more power.

Ok here's a dumb question. I'm kinda in the middle of doing the same thing. I want to run one of those steel braided carb inlet set up's but all i see is the inlet to them are AN fittings. I could run the braided steel line right down to my mech pump but where do i mount the filter? inbetween pump and carb inlet? there seams to be a big lack of AN female adapters etc... or at least 6AN female to either male or female npt. wow that was confusing sorry

Pauly, my old "fuel log" is for sale.

here's my old setup:

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1011318.jpg

Is that what you're talking about doing?

If you are the fuel log is $60.

I re-used the filter, and the Mechanical pump is sold. its all 8an.

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1011230.jpg

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1010669.jpg

Great pics very helpful thanks. Is there an advantage to running the filter before the pump?

you can run a filter before the pump but it has to be a course filter, around 100 microns so it doesnt cause to much restriction for the pump to pull fuel through. the one after the pump should be the finer filter of around 40 microns

those are some good pics!

How do you figure AN sizes?
What is -6 and -8?

Take the AN size and divide by 16. Therefore -6 = 6/16 or 3/8 and -8 = 8/16 or 1/2.

Great pics very helpful thanks. Is there an advantage to running the filter before the pump?

The pump should be before the filter. Mechanical pumps are good pushers, but not pullers. You don't want a vacuum on fuel either as it can cause vapor lock.

The previous suggestion was good about using a low restriction pre-filter before the pump, and a fine filter after.

Take the AN size and divide by 16. Therefore -6 = 6/16 or 3/8 and -8 = 8/16 or 1/2.
Thanks

I used a filter before the pump that claims a 300gpm flow rate. I've worked on alot of cars with the filter before the pump (electric pump), and they work fine.

Infact magnafuel designs their pumps with a filter before the pump.


I have another filter after the pump, but its right before the transition into the stainless line, next to the frame rail.

Here's a shot of how the front of the new system, nearing completion. With the semester coming to an end at school, i've been limited on my spare time. Should finish it up tomorrow.

http://i27.photobucket.com/albums/c181/SpeedyGoomba/P1011446.jpg

BTW, Jiffy-Tite fittings are REALLY COOL!