Nylon Fuel Lines

So I had a heck of a time getting a quick disconnect off my fuel pump cover on my 05 Subaru WRX project. In the process of doing it I destroyed the quick disconnect fitting. There was significant corrosion between the fitting and the fuel line.

In order to fix it, I picked up a 5/16" brass repair fitting to add a short section of rubber fuel line and a new quick disconnect.

Problem is no matter what I do or what type of clamp I use, I can't get the joint between the nylon line and the brass fitting to seal. I get a small leak every time.

I really do not want to drop the tank to replace the fuel line. The car has 237k kms on it up north. Although it has been undercoated and the body is in nice shape, most of the items like fuel tank strap bolts have significant corrosion.

Any sealants that I could add on the brass fitting where it goes into the nylon line?

Any other ideas?

I didn't re-read this before posting the link, but I believe someone in here mentions how to connect them up?

https://grassrootsmotorsports.com/forum/grm/learn-me-nylon-fuel-lines/108347/page1/

Edit: Can't get the stupid link to work...

Edit edit: The stupid link works, and I don't know how I did it...

I've gotten very good at putting plastic quick disconnects back together after they disembowel themselves on removal. The little spacer between the two O-rings rusts to the tube.

I've also been known to order a replacement quick disconnect (generic) and steal its O-rings, spacer, and retainer.

If you cut the plastic line off already... there are compression fittings made for plastic. I believe Dorman carries them. They work fine if you get the right one. They make them plastic/plastic and also plastic/metal for attaching a plastic tube to a metal hardline.

I was repairing a rusted out section of line on a CR-V a few weeks back and did some research on the nylon line. Getting a good seal required heating the nylon with a heat gun, or a hair dryer in my case, and driving the line completely down on the brass fitting. Once it cooled there were no leaks.

You're using the special compression fitting for automotive nylon fuel lines, right? It's that or a barb you press into the tube, the only time I repaired one that's what I used, manged to get it on with my hands and a hairdryer. Dorman stuff is good for this. When I fixed mine (GM product) the parts store actually had a kit on the help rack with a improved all plastic QD on a section of nylon line and a union barb.

I went and picked up the proper fitting that you push the nylon tube into both sides and a foot of new nylon line. Then I can take it inside and put the quick disconnect on and then use the push fitting out in the garage. Only cost me $8.24 to get the right parts. Should have done this in the first place!