I loosened the gauge to adjust reg. did not reapply silicone and wasn’t sure how much to tighten. This is 33 hours between pics
Would you consider this a slow leak?
- Thread starter _walter_
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I'm going to say you're looking at a change in temperature slightly dropping the pressure after filling. If you have the time to wait and be sure, that's best. But I think you're probably good.
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I don’t believe that’s a leak. That gauge isn’t accurate to tell the minute distance the needle moved. Wait another 33 hours, or just go out and use it.
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I wish my P35-177 was only changing that much in over a day. I'm loosing 15 bar or more per day. Not coming out the muzzle (ballon did not inflate) so I'm assuming one or more O-rings need replacement. It still shoots fine so I will get to it when I get to it.
If your first reading was right after a fill I agree with everybody else, it's normal for the air to cool and the pressure to decrease slightly. If the gun wasn't filled and didn't otherwise change temperature between readings it could be that you have a very slow leak. Might want to tape a ballon over the muzzle to see if it is the poppet. If not, then tighten anything lose and if that doesn't fix it new O-rings should.
My PCPs are more dependable than many of my other possessions but they still need some attention at times. Pain in the backside but not much alternative other than dealing with it. (I'm taking a break, been working on my sprinklers for multiple days on and off)
If your first reading was right after a fill I agree with everybody else, it's normal for the air to cool and the pressure to decrease slightly. If the gun wasn't filled and didn't otherwise change temperature between readings it could be that you have a very slow leak. Might want to tape a ballon over the muzzle to see if it is the poppet. If not, then tighten anything lose and if that doesn't fix it new O-rings should.
My PCPs are more dependable than many of my other possessions but they still need some attention at times. Pain in the backside but not much alternative other than dealing with it. (I'm taking a break, been working on my sprinklers for multiple days on and off)
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These small gauges are usually inaccurate...if you get an accurate one, never get rid of it! 
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so how do you know if the gauge is accurate ? when i set the auto shut off on my Omega and fill my Daystate (digital) both PSI match. But when i fill the Mac 1 the Omega reads 1500 PSI and the Mac reads 1150These small gauges are usually inaccurate...if you get an accurate one, never get rid of it!
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I’m sorry to laugh but absolutely not. Anyone saying yes must have never owned a gun that sealed in their life.
but absolutely not. Anyone saying yes must have never owned a gun that sealed in their life.Upvote 0
My RAW's gauges have been off and recently had Martin replace one (because it bothered me a bit)....When I refill, my tank gauge, the larger one on my JB tank reads about 20 bar different than the guns gauge, plus when I top it off it reads about the same, 20 bar difference....not a big deal since I know how far off it is and rarely shoot down to the reg setting it's just something I have to live with...
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my gauge on the mac 1 possibly reads low but i'm not sure ? guess i will have to get a gauge that tests @ the fill port .
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Even on digital gauges I see change. Time is the only way to tell as temp changes have an effect. Especially before and after filling.
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Couple years ago i had to know if my tank gage or my gun gage was off, and not having correct fittings this is what ended up telling the truth, my crosman gage was off 400 psi.
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Prob temp change as mentioned. Agree with giving it more time.
For the comments that are saying the small gauges aren't accurate so that is what is causing the difference in readings...I disagree with that. True that the small gauges tend to give a less accurate reading for many reasons (160bar might read as 150bar), but the readings do tend to be consistent with them. So a reading of 150bar on day one will still read 150bar on day 12, provided there are no leaks....even though the pressure has always been 160bar.
For the comments that are saying the small gauges aren't accurate so that is what is causing the difference in readings...I disagree with that. True that the small gauges tend to give a less accurate reading for many reasons (160bar might read as 150bar), but the readings do tend to be consistent with them. So a reading of 150bar on day one will still read 150bar on day 12, provided there are no leaks....even though the pressure has always been 160bar.
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