FX Impact m3 leak from mystery spot ?

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Baddoglowder

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Oct 10, 2021
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Flatwoods Kentucky, United States
Got a leak from the add on 2nd reg gauge , I believe I got it from Huma but not sure the manufacturer . It is the little oval hole where the pencil points to . I’ve looked at schematics and still can’t find the source . I’ve already replaced the oval shaped O-ring behind the gauge plate between where it attaches to the rifle frame .
Anybody had this one go bad before - you might save me a lot of searching .

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Baddoglowder said:
Got a leak from the add on 2nd reg gauge , I believe I got it from Huma but not sure the manufacturer . It is the little oval hole where the pencil points to . I’ve looked at schematics and still can’t find the source . I’ve already replaced the oval shaped O-ring behind the gauge plate between where it attaches to the rifle frame .
Anybody had this one go bad before - you might save me a lot of searching .

View attachment 575551
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Yes, there is an o-ring that goes in the oblong opening, should have come with the kit
 
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I took the offered advice, much anppreciated, and grabbed my o-rings , went to work . I am having trouble finding the hidden o-ring in the block . Right now all I have is stainless pics so I ordered a brass one and waiting but the holiday weekend will slow things up a bit . I did notice the regulator is different than videos I’ve watched . I have an early M3 in .35 . Mine does not have 2 washers on the small brass end that comes out of the aluminum housing . Mine has no o-rings and it also is a screw driver head Not an alien screw head . It sure makes it a pain in the rear to work on As it’s not the same . I also noticed the Fx schematic shows x2-1 and x2-5 o-rings . What gives with that ?
the gun shot and held air for 4 yrs .
also this regulator came from huma with 9 washers - the package when new said it was a huma extra high pressure . The huma sight shows 12 washers . I have 2 as I purchased a spare by accident and robbed 3 washers from it .
Thinking about calling Utah air next workday as I just got some parts from there and may need to buy some more to get this going ….the hidden o-ring has me stumped and confused especially after seeing differences in instructions ?
I’ve worked on it before , always with instructions in front of me or a video but this time it’s kicking my rear-end .
 
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Endoscopic camera in hand and set of dental pics in other , flashligh in mouth I got the old o-ring out and new one in - still leaking . I’ve replaced the outer aluminum housing o-ring ,inner o-ring . O- ring on the small brass piece , o-ring in the block not once but two different o-rings I had on hand and still leaking .
Also done the oval one on the angle bracket the gauge sets in . I’m stumped - is there another o-ring hidden in here .
I hate to give in and send it off - I feel I lost the fight if I give in -but would like to shoot the rifle before summer ends … by chance I ordered 10 more of the 10x1.5nbr90 but all capt. o-ring has is nbr70 , hoping this will work or I can order from a Fx dealer if necessary . Capt o-ring says these will work . That’s his business so I guess he’s right ? At any rate the ones I had were from complete replacement kits of all the needed o-rings for the m3 from a Fx dealer so it should have worked .
I’m lost but not giving up - anyone have any experience with the in the block X2-8 on the Fx charts ?
Also doing a search on AGN !
 
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Jay308 said:
Can you just remove the angle block and screw the gauge into side with a new x-ring. This will tell you if it is the angle block or something internal. If it doesn’t leak, you can just shoot it.
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Hole in impact is micro small where the gauge bracket goes . I could possibly re-install the small Allen screw to seal it off but I’m not sure I still have it handy after putting the gauge on . plus I am sure it’s from inside - seals for a few seconds after I installed the o-ring inside the block but gave way and rushed out until I removed the bottle again . It’s from inside the block - why the o-rings I installed didn’t fix it ? It also wouldn’t be so bad if not in such a small place to get to .
 
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Baddoglowder said:
After studying the huma regulator pics further there appears to be 2 for a total of 3 o-rings in the aluminum housing - so that is the problem as it only replaced one at the bottom internally . I am willing to bet that is the issue and will know for sure tomorrow when I mess with it again .
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Please let us know if you fix the leak.
I hope you are correct and you missed an o ring. I am having a similar problem at the moment on my M3.
 
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Nothing wrong with the new AMP reg's, I don't see any improvement with HUMA, although I do use HUMA, whatever I have available. If I had to choose one it would be AMP.

The HUMA EHP reg only takes 8 washers 0.6mm thick. Not sure why they send 9 with them. I guess just to make sure you have enough. Cheaper than mailing just one I guess.

The hole is probably the atmospheric vent. At least that what the block covers. Id remove the block and replace all the reg orings and see if that solves your problem. Only then would I tackle the oring in the block. They are hard to see and fun to replace.

Here's my tip. When replacing the block oring, put just the reg piston and washers in the gun. The washers will keep the oring from going too far below the groove and make it much easier to get in. Don't let this oring go for years and years and get tough & hard, that makes the terrible to get out. If they're soft, as they should be, you can punch them with a hat pin and lever them right out. If they get hard, you have to keep picking at them until you break them or can get behind them and it's a job. My last one got really hard, took 2 hours to dig out and it broke to pieces in my hand, whew!
 
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After having the o-ring in the block in and out 20 or so times I finally solved the problem , but not after pinching one of them being in a hurry . Turns out it was the other 2 o-ring (3 total ) internally inside the huma aluminum housing . It does make it muck easier with the piston and washers inserted to fit the o-ring inside the block . I still don’t have the regs set to exactly but getting Closer . These are seriously finicky regulators . There is several good videos online youtube . It takes alot of concentration when the mood is right with no distractions and still another day or two sometimes even with everything you need ready plus a small endocamera with lights helps to verify what you think your seeing . A good brass pics helps but can be done with Stainless dental tools that are sharp - just don’t go down too far and scratch that area the washers ride in . here a brass pick would be preferred that is sharp to stick the o-ring to get it out of the groove it rides in . The small aluminum housing that has 3 small o-rings is just as much fun ! I used a wood stick(screwer or corn dog stick ) in both applications to push the o-rings down after pinching it to put it inside the block plus the trick of setting the brass part with the small o-ring into the block to help guide the o-ring into the groove (endocamera here sure is nice and I say indispensable if you do this at home ) . Because you can go too far here as it will allow the o-ring into the area where the washers are also located , don’t ask how I know this part - pays to keep a stockpile of o-rings around for just encase times like these . I put the pinched side down towards the indention that the ring sets in working it down with the stick until it goes in , which can be quick or can be 2 evenings depending on you luck and chance . I believe you do get better at it with practice and the endo canera here becomes the best $30 bucks you ever spent this week- anyhow .
It does seem that if one o-ring blows before it’s finally said and down atleast one more pops or gets damaged taking apart or assembling the rifle . In 4 yrs ownership this is the 2nd foray into o-rings so probably not too bad but the rifle did have to go back to the service center one trip for repairs beyound my skill level plus I had to replace a receiver due to exploration and modifications , not a good idea .
I also noticed this hot weather sure tests out a compressor . Everytime I do o-ring repair I end up needing a couple tank fill-ups or top offs because of going thru air getting everything put back together plus a few opps along the way .
Seriously , you really do need a good assortment of o-rings on hand . Im trying to keep 2 or more o-ring sets for every gun unless you like tearing apart and waiting for parts . I’m learning this secret the hard way a-couple times already . Now trying to stock up on Gx compressor parts for the eneventable break down . I also try to do refills usually inside the a/c house and even here I use a 20” box fan trying to preserve compressor life and moisture issues .
 
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