I just noticed a small fuel check valve leak on my 04 dyna low rider that's fuel Injected. It only seems to leak when ignition is turned on. The fuel line is secured in that collar ring as well.
anyone have an idea if what three issue could be and how to fix? Im attaching pics that may help. Thanks in advance.

 

Purge the line by pulling the fuse and turn the motor over a few times. Disconnect the line and then re-connect it. See if it still leaks.

If it does replace the o ring in the quick detach

 

Two o-rings up in there. Always purge pressure before removing or it dislodges the top one.
They also are just old and going back requires new ones. Looks like fitting could use a 600 silicon carbide paper polish.

 

Fuel Tool has a complete kit of O ring for the rebuild of the check valve.
I got my lower o rings from them, work perfectly !

 

Thanks for the info. Does anyone but chance happen to know the size of the o rings? There's 1 in male end and 2 in female. I was told to try oil drain plug o ring but I'm pretty sure the 2 in female end are different sizes. ??

 

You need Viton fluor O ring to resist fuel, the drain plug oring is nitrile and will not hold more than few days.
All you need is here -> http://fueltool.com/motorcycles/

 

Their site is giving 404 error on product pages. Any other place to get viton o rings? Is viton what harley uses in there check valves?

 

checked it, site is working

 

They are about 3-5$ on eBay. Do a search.
size been posted on here numerous times