My fx boss isn't holding air, I just changed the o rings on the foster fitting and still nothing. Any suggestions? Might it be the little blue pin that closes when charging it "airing it up"?
- The AGN App is ready! Search "Airgun Nation" in your App store. To compliment this new tech we've assigned the "Threads" Feed & "Dark" Mode. To revert back click HERE.
Boss not holding air
- Thread starter Pnutt559
- Start date
Yeah you can clean out that area of the fill valve. Easy to get apart might just need that oring or area to be cleaned, also sometimes the mount where the stock attaches there's an oring under there that can leak sometimes.
Upvote 0
Is it not charging or is it leaking after charging? "Isn't holding air", to me, means it's leaking somewhere but I want to make sure I'm understanding correctly. Or is it that you can't get air to go in it?
EDIT: just noticed you have another post running on this subject ("rifle not holding air") with a better explanation.
EDIT: just noticed you have another post running on this subject ("rifle not holding air") with a better explanation.
Upvote 0
I tried that already, still same result, I can fill the gun, but after I try to bleed the air, it all comes out through the bleed valve of the tank, like something isn't closing, when I pull the tank hose off, all remaining air comes out through the fill valve on the gun
Upvote 0
It will take air, but once I open the bleed valve on the tank all air comes out from the gun
Upvote 0
Is your gun's bottle valve sticking open? I've never had my Boss apart so I'm guessing here.
Upvote 0
I took the bottle off, cleaned it, not very good, but did it, still the same thing, I had the same problem with the gun when I purchased it, brand new, it was the check valve
Upvote 0
Yeah, that was before I changed the o rings, thought it would fix the issue by changing them, but still nothing, I had the same issue when I bought the gun, new, they sent me a replacement check valve, which fixed it, but now it's happening again, just dnt understand why a 2000 dollar rifle would keep having that issue
Upvote 0
Sorry you're having trouble. Mine has been absolutely trouble free always. I'd contact FX again. Once is a fluke, twice is indicative of a problem. When you open your bleed valve do you do it quickly? Fill SLOWLY, bleed QUICKLY (but you probably knew that).
Upvote 0
My friend had the same problem. We took the fill valve apart and changed the o rings. They are the harder kind that are white. Had to go to a high pressure air supply.
Upvote 0
Can also just try cleaning that sealing surface inside the fill probe and flipping the hard oring Sdellinger is mentioning. I bet that will cure it, apply some silicone grease of course.
Upvote 0
Make sure that after filling, your fill probe or air hose fitting is not falling down somewhere where it's picking up dirt dust or other grit that might be getting blown into your fill port check valve, contaminating it.
Upvote 0
Yeah it really sucks, I will definitely contact them and see what they say, I contacted an airgun store here where I live but they only work on rifles they sold. Yeah that is the procedure I follow when filling.
Upvote 0
My apologies, I have not tried that, I purchased the regular rubber o rings from ace hardware. The white o ring doesn't seem damaged though, probably because it is hard to tell because of the type of o ring. The larger o ring seems to be a regular rubber one.
Upvote 0
Well you should try it, 98% it will fix it in 2 minutes with no parts needed. Its most likely dirty inside doesn't take much to make it not seal.
Take your fill port off with gun degassed, remove blue thing inside it. Remove the white oring. Clean the sealing surface inside the port well clean the blue thing, flip the oring over, lube with silicone.
Fixed.
Upvote 0
Ok cool, I had already removed the valve but have to admit I didn't do a very good job of cleaning it, will try it this weekend and hopefully you are right, thanks for the advice.
Upvote 0
Silicone grease, and make sure you clean INSIDE the foster fitting where that oring will seal. Probably just some crap in there. You can try it dry before grease if you don't have any.
Upvote 0