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pressure gauge on pump not reading how much psi

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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pressure gauge on pump not reading how much psi

Unread postAuthor: ilikeguns » Tue Mar 27, 2007 4:24 am

hey ive just finished building my pneumatic gun and when i attach the pump to it and start pumping the pressure gauge doesn't read how much psi is in there, ive tryed it on 3 pumps all with the same results and its not leaking plz help me
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Unread postAuthor: shud_b_rite » Tue Mar 27, 2007 4:28 am

Sometimes on cheap gauges the needle gets stuck to the face of the gauge. Try flicking it a few times with your finger to try and get it lose. Or you could have put it on the wrong side of a valve. Or maybe the gauge is blocked by some dirt or something. Or your gauge is faulty, ooorrr you are just not pumping hard enough.

Thats all I can think of
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Unread postAuthor: ilikeguns » Tue Mar 27, 2007 4:42 am

hm ive tryed the flicking thing just then but it hasn't made a difference and like i said ive tryed it on like 3 different pumps so its not that there faulty or cheap. thanks for ur comment tho
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Unread postAuthor: joannaardway » Tue Mar 27, 2007 4:46 am

We need a picture of where the gauge is. It might be wrongly postioned.
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Unread postAuthor: shud_b_rite » Tue Mar 27, 2007 4:53 am

Are you talking about the pressure gauge on your cannon or the pressure gauge built into the pump. If the pressure gauge on the pump is not moving then that means that there is a leak somewhere.

Yea a picture would be helpful
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Unread postAuthor: hi » Tue Mar 27, 2007 7:02 am

Maybe you didnt drill the hole deep enough. The only other thing i can think of is that you have a really leaky chamber and it leaks out just as fast as you put it in. If you pump for a while and it still reads zero and you open the valve does the air come out of the chamber or is it empty?
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Unread postAuthor: Scope » Tue Mar 27, 2007 5:37 pm

What is the type of valve... if its anything but a ball valve theres a good chance that your pump cant seal it fast enough
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Unread postAuthor: noname » Tue Mar 27, 2007 5:42 pm

"What is the type of valve... if its anything but a ball valve theres a good chance that your pump cant seal it fast enough"
Not true, I have a pretty crappy bike pump but I'm able to seal anything I make, otherwise it's useless to me. This has included spirnklers, barrel sealers, coaxial diaphragm valves, etc.
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Unread postAuthor: ilikeguns » Tue Mar 27, 2007 8:29 pm

its not a leaky chamber after i pump it the gauge on the pump says on 0. after i open the ball valve air comes out, if i put the pump on the very end of the schacher valve it reads it for a bit then the pump thing pops of at 40 because its on the very end of the valve , i might just need to put a gauge on the chamber. thanks for ur comments
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