FX FX M3 power plenum leaks/drains through 1st reg

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rc4fun

rc4fun

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Oct 20, 2020
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Owings, MD, United States
First off if you are not helping and hate FX just move on..
My M3 with PP upgrade started leaking fast, OK no big deal I'll replace some O rings and be done. Well the first thing I notice is that the plenum empties through the front reg when the bottle is removed. WHAT? I changed the front reg (new) still the same. Changed the 2nd reg (new), no change. Changed the PP O rings and I think every other O ring including the 2nd stage one that is buried.
Anyone have an idea what I am missing.
Thanks much. Kerry
 
rc4fun said:
First off if you are not helping and hate FX just move on..
My M3 with PP upgrade started leaking fast, OK no big deal I'll replace some O rings and be done. Well the first thing I notice is that the plenum empties through the front reg when the bottle is removed. WHAT? I changed the front reg (new) still the same. Changed the 2nd reg (new), no change. Changed the PP O rings and I think every other O ring including the 2nd stage one that is buried.
Anyone have an idea what I am missing.
Thanks much. Kerry
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Yeah. No bottle it will do that depending on the settings. Nothing to worry about. I prefer mine does that instead of having to bleed screw it down.

Valve seal and the oring out the back of the power block for the valve rod should be checked iirc if you could point out exactly where your plenum leak is in a Pic I may be of more use.
 
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OK it's fixed, I wanted to wait and see if it leaked over night, all is good. Once I ignored the air drain through the 1st reg and looked for the real leak it was easy, Thanks @6gun. The E 100 o rings were bad. Strange now that it's not leaking it no longer drains air through reg #1 when the bottle is removed.
 
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rc4fun said:
OK it's fixed, I wanted to wait and see if it leaked over night, all is good. Once I ignored the air drain through the 1st reg and looked for the real leak it was easy, Thanks @6gun. The E 100 o rings were bad. Strange now that it's not leaking it no longer drains air through reg #1 when the bottle is removed.
Click to expand...
When you have to degass with the bottle removed I recommend not firing it down to 0 but use the bleed screw on the side of the action block so you avoid over travel on your valve and potential oring damage.
 
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