FX Impact leak....part 2. It's back...

My gut feeling is still the valve seat. I’d just change it. Also if you have plenty of orings on hand they are so cheap I just replace them all if I have gone to the trouble of taking it apart. I know you’ve do a lot but Just thinking about your regulator, inspect everything for sure but clean and rebuild it anyway. Including the tricky internal one.I have rebuild my regulator without doing that one only to have to pull it apart again! The other thing to do if you suspect you have a slow leak is spit on your finger and wipe it across the small bleed hole at the trigger/regulator. If the regulator is leaking very slowly you’ll get a bubble forming there. 

If you did send it off to fx my bet is they wouldn’t spend to much time trying to find a nicked oring they would just rebuild and change out the parts in the known suspect areas. Specially the valve seat. Sometimes tiny fractures can be invisible In the long run it’s quicker and you know that it’s been rebuilt for peace mind. 

You fix you problem and do your preventative maintenance at the same time. 

Hi brother ifyou ever find out if it’s the valve rod that did the leaking. I have the same problem with my FX Impact MK2 still couldn’t figure what’s the deal. Any suggestions input. Please let me know I don’t really want too send my stuff in if it’s some em small fixed 

Hi brother ifyou ever find out if it’s the valve rod that did the leaking. I have the same problem with my FX Impact MK2 still couldn’t figure what’s the deal. Any suggestions input. Please let me know I don’t really want too send my stuff in if it’s some em small fixed

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Polish the valve rod where it passes through the seal at the front of the airtube/plenum.

Is that a known issues problem that has been leaking? So did it really stop the leak by polish the rod and internal plenum. I just put in a new order of valve rod, valve complete and hammer seat hope it fixed the problem. But at this point I give up trying find trace 

Is that a known issues problem that has been leaking? So did it really stop the leak by polish the rod and internal plenum. I just put in a new order of valve rod, valve complete and hammer seat hope it fixed the problem. But at this point I give up trying find trace

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Yes and you only need to polish the titanium valve rod where it passes through the seal. Nothing needs to be done to the plenum.

When searching for air leaks, use a piece of flexible tubing as a stethoscope. Stick one end in your ear. When the tube is directly over the leak the sound through the tube will be loud.

If its leaking there should be hissing or getting leak detector to bubble here.

The tube trick heavy mentions worked for me in this exact area.

Stoti,

I recently had a leak in my Gen. 1 Impact. Fortunately I got it fixed the first time. What I did was watch Ernest's leak video and got a can of the leak detect. 'Spensive stuff....maybe soapy water will suffice. If you've done this then disregard. Mine turned out to be the Quad ring; the leak showed up in the Power Wheel area....And as luck would have it the Quad Ring lives in the deepest darkest recesses of the Impact. It requires a total tear down. So while I was there I just replaced ALL of the o-rings.

Also I used Balistol for all tube interiors followed by a clean cotton cloth to dry. A lot of crud builds up in the Plenum tube and valve stem tunnel. You might have dirt causing a new o-ring to leak. Also be sure to use Balistol and a lintless cloth to clean the o-ring grooves good. Dirt in there will cause leaking. Everything needs to be clean clean clean! With o-rings removed, use Balistol everywhere you can then dry well. I then used a very light coating of SuperLube silicon in the tubes....VERY LIGHT. My thinking was to aid o-rings as they slide back in.

One thing I did read was sometimes the valve rod wears a bit as it rubs the quad ring. So get some 1200 grit 3M polishing paper and rub that area good and inspect. Actually just polish the entire valve rod.

If the valve rod is really worn at the Quad, then I guess it should be replaced. FX could better tell you then me.

Anyway its frustrating.

I had trouble with a leaking Kalibrgun Cricket a couple years ago, I tore it apart like 4 times, replacing o-rings every time and still ....leak! I talked with Ernest and he had me dunk the front of the gun in water and I saw a stream of bubbles. Turns out it was a leaking Pressure Gauge...not at the connection but out of the gauge itself! Ernest said he had never seen that but he sent me a new Wika gauge and it fixed it.

Try the leak detector on gauges as well. 

That's my $.02 so good luck and I hope you nail it!