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Advice New To Pcp, Why Isn't The Pump Filling The Gun?

Discussion in 'Anything Airgun Related' started by AP3, Jun 16, 2019.

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  1. AP3

    AP3 Member

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    Hi All,

    I have my first PCP, having always used springers up until now.

    It's a Gamo GX-40 (cheap!), ordered from Pellpax, and came with an Artemis pump as one of their packages.

    The gun has air in it, but I want to keep it topped up after a shoot.

    I've put the pump together, using PTFE tape on everything I screwed in/on, and it doesn't seem to be leaking.

    However, once the pump gets to about 150 bar, it stops going up, and nothing seems to be going into the gun. The gun is at just below 200 bar.

    I was pumping it for around 10 minutes solid, and nothing shifted at all. Is his normal, and I'm just not pumping enough, or does it sound like something is wrong?

    I'm going full up to full down, pausing at each. I'm "only" 12st, so takes a bit of time to get it all the way down.

    Cheers,
    Andy
     
  2. MADEinSTOKE

    MADEinSTOKE Engaging Member

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    Could be a faulty gauge on your pump ....if you have just under 200 bar in the gun
     
  3. AP3

    AP3 Member

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    The gun isn't going up either, it's maximum fill is 232 bar. :/
     
  4. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    The gauge on my wife's GX40 reads 10 bar low, but one of them should be moving. Faulty pump?

    Where in the country are you?
     
  5. SlyM1ke

    SlyM1ke Posting Addict

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    Did you're pump come with a blanking plug? If so try pumping it to the desired pressure and see if it holds a charge.

    You might have a dodgy pump or a leak, or maybe the connector for the gun is meant for bottle filling and has a restrictor in situe that needs removing.
     
    Kev The Fish likes this.
  6. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Yes I would agree that the blanking plug in and keep trying to get the pressure up to 200bar would be my first step too. That's how I tested my first PCP stirrup pump. It won't take more than a few pumps either
    Kev

    .
     
  7. Accuspell

    Accuspell Pro Poster

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    If you have got 200 bar in it, STOP. You have already gone beyond the most efficient pressure.

    Yes, I know it is rated to 232bar - that doesn't mean you have to fill it to 232bar, that is just the MAXIMUM working pressure. The only time this doesn't matter is if your rifle is regulated. In an unregulated rifle the point of impact will change at highest pressure from the main middling pressure and again at low pressure. Ifyou have a regulator, the shot pressure is the same with every drop in pressure from the cylinder until you get the same pressure as the regulator is set for.... then you lose the rest of the air in the cylinder/bottle because there is insufficient pressure to hold the regulator closed.

    Rough rule of thumb, for any sub-12 PCP: fill to 180bar and shoot down to 110bar. The pressure drop across this range will effect your point of impact the least. if you zero at 150bar, you will be as close as you can be for the full pressure range. DO NOT BE SURPRISED if you then pump her up to 200bar that your point of impact is 1" or more away... shots can go wild, then as you come down to the 'magic pressure' they suddenly go to your zero point of impact again and remain faithful until you drop off the bottom end, when the pellets simply don't have enough waft to get to the target. This 180 - 110 is as close as doens't matter for all rifles... some will now come on and say "my sweet sector is from 190 to 105" EXACTLY, as near as doesn't matter what I have said.
     
    Buckshot and Kev The Fish like this.
  8. That hurts

    That hurts Barely Active

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    I'd check for a flow restrictor in the connections and remove and retry
     
  9. AP3

    AP3 Member

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    South East, near High Wycombe.

    No blanking plug, just a quick connect to thread the adaptor onto.

    What would that look like? It looks like a straight hose that screws into the pump, then goes to a nut, into which a quick connector is installed, then I screwed on the adaptor.

    It's definitely hard to push at the bottom of the stroke, so I'm compressing air, it just doesn't seem to be going anywhere, nor the pressure of the hose increasing.

    Cheers,
    Andy
     
    That hurts likes this.
  10. timmytree

    timmytree Top Poster

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    How many pumps did it take til the needle on the pump gauge stopped moving? Once the pressure in the whip and the gun equalize it often seems as though not much is happening.
    But as pointed out, 200 bar is enough anyway. Shoot it down to 100 bar and try again.
     
  11. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Andy check the fittings are tight and bleed valve is also tight, I found mine needed tightening fairly hard.
    Usually most pumps have a blanking plug just like a foster quick fit and and knurled flat end (or it is on my compressor and old stirrup pump)
    It will be pretty hard pumping from about 130 bar up but just keep slow steady pumps
    Kev

    .
     
  12. SlyM1ke

    SlyM1ke Posting Addict

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    It looks like a screw inside the quick connector, you can remove it if you are using a hand pump.
     
    That hurts likes this.
  13. That hurts

    That hurts Barely Active

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    As above and can be a slot head screw like the one below or some of the Best Fittings adaptors have a small black grub screw type affair with 2.5mm allen slot :

    Restrictor.jpg
     
    SlyM1ke likes this.
  14. pjgtech

    pjgtech I shoot, therefore I aim......

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    I'd get rid of the ptfe tape, high pressure stuff should have metal to metal seals with no jointing compound, tape, etc.
    Using ptfe could introduce a leak due to not sealing properly? Hope u get it sorted matey... :thumb:
     
    oxwich likes this.
  15. AP3

    AP3 Member

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    Thanks to everyone for the advice! I'll have a good look tomorrow, and see if I can't figure it out, I'll email the Pellpax guys,

    It is a "Best Fittings" adaptor. I didn't notice a screw, but I'll take a look!

    Cheers,
    Andy
     
  16. AP3

    AP3 Member

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    I've taken it apart to have a look, and there's no screw to be found in any of the joints. I've removed the PTFE tape, and put it all back together and tightened it all up. Now it's leaking around the bottom of the piston most of the time. Hard to tell if it's the O-ring there, or the bleed valve leaking (tighten as much as I could).

    Anyway, weirdly, sometimes it won't leak and will build pressure, but no air seems to be getting into the gun. See attached photo of the result of some vigorous pumping whilst the needle on the gun's gauge didn't shift a micrometre!

    Thankfully it didn't blow up in my face, as you can't see the gauge from the top!

    IMG_3491.JPG
     

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