Well, let’s spread the knowledge.
I have no special tools and I didn’t want to buy any. I figured out how to do this easy along time ago with the help of my neighbor that's been doing this for years.
The trick is how you cut the line in the first place. If you use a miter saw with a metal part-off blade, it makes adding the OD fitting a bunch easier.
First thing is a little info about AN fittings. AN stands for (ARMY/NAVY)
Second thing is if you want to know what the AN size is in inches, just divide the AN size by 16
Examples-
-4 = 4/16 = .250 converted to a fraction = ¼
-5 = 5/16 = .312 converted to a fraction = 5/16
-6 = 6/16 = .375 converted to a fraction = 3/8
-8 = 8/16 = .500 converted to a fraction = ½
-10 = 10/16 = .625 converted to a fraction = 5/8
O.D. = Outer diameter
I.D. = Inner diameter
1) Cut the line with a metal part off blade on your wood cutting miter saw. (I know everyone has a miter saw, right?) My set up is a 10” Miter saw with the part off blade.
2) Blow the line out.
3) Take the little cap off an oil quart and fill with oil.
4) Dip the cut line end in the oil and shake the excess off.
5) Work the O.D. fitting over the little stainless frays.
6) Press the face end of the O.D. fitting against a solid surface. (You will be holding the line about 6" from the fitting and pressing so that there is pressure on the fitting) It's better to use a wall as the surface so you can apply pressure with your body.
7) Place an adjustable wrench on the fitting and twist as your applying pressure to the fitting. Keep doing this and checking the progress. You want the hose end all the way flush with the little cavity in the I.D. of the fitting. ***You can wrap the fitting in a rag before putting the wrench on it to avoid damage. I really haven’t noticed big damage to the fitting by not doing this but you have to make sure the wrench is adjusted with no slack. The ideal way is to have aluminum wrenches for AN fittings.
8) Dip the second pc of the fitting in the cap of oil.
9) Place it in the hose assembly and start to screw it together.
10) Keep reference to the line and the first fitting pc you added. You can do this by making a mark where the fitting is in relation to the hose, or just place your hand on the fitting where it meets the hose while your turning to make sure it’s not separating. Again, you want to make sure it's not slipping back off the line while your turning. I've found that if you make sure to butt the line all the way in the cavity of the first O.D. fitting, the line will not back off. The only time I've had the line back off is when I didn't do this.
11) Blow the line out again.
12) Done deal
Different hose and fittings companies are different. I've found Russell line and Jegs fittings to be a cost effective, and easy assembly for making these lines.
If your lazy then just go here.
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=FEED&Category_Code=OIL