6 replies to this topic

[aribiter]

All right i got a at4k and at2k. and for some reason the pumps dont hold air. They just push it back out. Can i fix this? I plugged the pumps but never pumped more than 5 times.

[LastManAlive]

Either the O-rings are shot, you have a leak in the vinyl tubing in the gun, or you have a valve leak.

Try taking the gun out of its shell and pumping it up under water with the valve sticking out as well as the pump. When you see come out you can then further inspect the gun for holes and try patching them with epoxy. As for the valve though, I don't know what to tell you other than try straightening out the pin in the valve if it is bent or find a new o-ring for the pump.

[aribiter]

I tried underwater and it was coming from inside the pump. Its not the oring. it will put air in the tank but then it comes out from inside the pump. Like if i pushed the pump back and let go the pump flies out a few feet

Edited by aribiter, 20 December 2006 - 06:45 PM.

[Starbuck]

I tried underwater and it was coming from inside the pump. Its not the oring. it will put air in the tank but then it comes out from inside the pump. Like if i pushed the pump back and let go the pump flies out a few feet

This is a common problem in air powered blasters that I have encountered countless times over the years. Not many realize what the problem is.

Observe, good man:



When you pump air into the tank, air is pushed through the pump tube valve, through the air line into the air tank chamber. The pump tube valve allows air being pushed in to pass, but the pressure from the air tank keeps the valve shut so that no air escapes back into the pump tube. What has happened is that the pump tube valve has been damaged. I've had several come out of the package like this, so it might not be your fault.

I know my picture is beautiful. I frolic in artistic meadows of creativity.

Hope that helps.

Edited by Starbuck, 20 December 2006 - 07:06 PM.

[aribiter]

So i cant fix it?

[Starbuck]

So i cant fix it?

No and yes. No, you can't replace the valve inside. Yes, you can replace the pump tube altogether and remedy the problem.

Post in the trading forum and try to find a new AT2k pump tube. Someone is bound to have one.

[WratH]

It is probably your check valve, aka one way valve, on your pump tube as starbuck mentioned. There is nothing you can do to prevent this, it happens to many airtechs. I fixed mine by doing this.