Others I need advice on using a bottle to charge my PCP

[hameditor]

What you’re running into is actually pretty common when switching from a compressor to a tank. The short version is: your tank isn’t actually at 300 bar anymore, even though the gauge says it is.

Here’s what’s happening:

1. Tank gauges are often optimistic. A lot of carbon‑fiber bottle gauges read high. Your tank may show 300 bar, but it might really be closer to 200–210 bar. If the tank and the gun are at the same pressure, no air will move.

2. Air only flows from higher pressure to lower pressure. If your pistol is at 200 bar and your tank is really only at ~200 bar (even if the gauge says 300), nothing will happen.When you shot the pistol down to 150 bar, the tank could only bring it back up to its true pressure — which appears to be around 200 bar.

3. The EDgun EaZy Fill won’t work if the tank isn’t higher pressure than the gun. It’s not broken — it just can’t push air that isn’t there.

4. The fix is simple: Get the tank topped off to a verified 300 bar (or whatever your shop can give you). Once the tank is truly above the gun’s pressure, it’ll fill normally.

5. Bonus tip: If you want to check your tank gauge, compare it to the gauge on your compressor or your gun. One of them will show the real number.

If you want to see which gauge is lying, here’s the quick test:

1. Fill your pistol with your compressor like normal.
2. Right after that, hook it to your tank (don’t open the valve).
3. Compare the two gauges.

Whichever one disagrees is the inaccurate gauge — and it’s almost always the tank gauge reading high. Once you know the real pressure, the fill behavior will make sense.

Great analysis. Thanks!

 

[Guinn]

I think all of us - me included - sometimes fail to take account of the potential for pressure gauge inaccuracy. Particularly that can apply to the small gauges on guns. Often these can be surprisingly accurate. However, not always.

To my knowledge, among manufacturers, only Umarex faces-up to this issue. In their User Manuals they advise that gauges can read by up to +/- 10 % Even on a 3,000 PSI fill, that makes a range from 2,700 to 3,300 PSI. A 600 PSI difference!

Yep. Problem solved. My bottle gauge indicates almost 100 bar more than the actual pressure.

 

[Grunt64]

Great analysis. Thanks!

Your very welcomed, I'm just happy I could help someone.

 

[Guinn]

Your very welcomed, I'm just happy I could help someone.

Problem is solved.The bottle pressure gauge indicates almost 100 bar more than the actual amount

 

[Guinn]

Thanks. You have confirmed what slowly dawned on me after posting my message.
I filled the tank several months ago and set it aside. When I started to use it for the first time the other day, I noticed the pressure gauge showed 450 bar…the “test pressure “ indicated on the bottle. That led me to believe that I had accidentally charged it to that pressure initially so I bled it down to 300 to charge my pistol! Now I’m thinking that I actually did charge the bottle ito 300 and gauge crashed later and went to 450.
I m learning!!

I think all of us - me included - sometimes fail to take account of the potential for pressure gauge inaccuracy. Particularly that can apply to the small gauges on guns. Often these can be surprisingly accurate. However, not always.

To my knowledge, among manufacturers, only Umarex faces-up to this issue. In their User Manuals they advise that gauges can read by up to +/- 10 % Even on a 3,000 PSI fill, that makes a range from 2,700 to 3,300 PSI. A 600 PSI difference!

Yep, I just refilled my bottle. My GX compressor shut off at 300 bar ( the working pressure specified on the bottle) and the bottle gauge showed 450 bar!!!! Now I’m going to attempt to order a gauge not having a clue as to thread size

 

[BanjomanMI76]

Yep, I just refilled my bottle. My GX compressor shut off at 300 bar ( the working pressure specified on the bottle) and the bottle gauge showed 450 bar!!!! Now I’m going to attempt to order a gauge not having a clue as to thread size

You mean the manual for the Manul doesn't show that ?

 

[Guinn]

You mean the manual for the Manul doesn't show that ?

You must be familiar with the Manul owners manual!

You mean the manual for the Manul doesn't show that ?

Obviously you are familiar with the Manul’s owners manual. You would think that for 850 bucks you would get some mention of the magazine and single shot tray without having to do a deep dive on UTUBE to find out how to install and load them!!!! Seems to be the trend now. For example , the FX DRS TACTICAL comes with a manual for the CLASSIC …..just to name one. Anybody out there without access to the internet is SOL for getting instructions on the use and operation of most products nowadays.

 

[Guinn]

Great explanation

Yep. When my compressor automatically turns off at 30 bar the bottle gauge shows 450!!