Compressor to Hand Pump Airleak Question

Information about fill options for PCP air guns.

Compressor to Hand Pump Airleak Question

Postby 1beezer » Fri Apr 11, 2014 9:10 am

I put the inline water filter with the 1/4" Foster connection to my hand pump. When I hook the air compressor to it there are air leaks between the pump base and the big brass nut at the bottom of the shaft. I can see and feel where the air is coming from between the round of the hole underneath the hex sides of the nut. This must be common or not. It's a new pump. Curious.
1beezer
 
Posts: 68
Joined: Thu Jan 16, 2014 4:09 pm

Re: Compressor to Hand Pump Airleak Question

Postby 1beezer » Mon Apr 14, 2014 2:38 am

I know people here boost their pumps. Could someone please tell me if air leaks out from under the pump shaft when the compressor is hooked up to it at say 20-30#.
1beezer
 
Posts: 68
Joined: Thu Jan 16, 2014 4:09 pm

Re: Compressor to Hand Pump Airleak Question

Postby Sandspike » Mon Apr 14, 2014 4:20 am

Put about 5 wraps of Teflon tape on the threads of the bottom nut and it will either slow down or stop leaking. Leaking at that joint does not harm anything and is not a real problem. The pump was not designed to have pressure on that point. A little lost air prior to first stage compression is not a big deal.
Daystate Huntsman Regal XL .22 cal.
Mrod Gen1 .22 cal. w/MDRL Bullpup
Mrod Gen1 .25 cal. w/MDRL Bullpup
Crosman Titan .22 cal.
Crosman 2240 .22 pistol
Crosman 1377 .177 pistol (30 yrs old)
2 Gamo .177 ?
2 Bug-A-Salts (Got Flys? Shoot um!)
Sandspike
 
Posts: 289
Joined: Tue Sep 24, 2013 6:21 am
Location: TEXAS

Re: Compressor to Hand Pump Airleak Question

Postby 1beezer » Mon Apr 14, 2014 4:52 am

Ok thanks again.
1beezer
 
Posts: 68
Joined: Thu Jan 16, 2014 4:09 pm

Re: Compressor to Hand Pump Airleak Question

Postby Asgard » Mon Apr 14, 2014 8:55 am

Mine did this at first too. I unscrewed it and replaced the o-ring that was in there. Now it has just the tiniest of leaks.
Asgard
 
Posts: 7
Joined: Fri Jan 31, 2014 9:30 am

Re: Compressor to Hand Pump Airleak Question

Postby 1beezer » Mon Apr 14, 2014 4:16 pm

I know that nut is cranked pretty tight.
1beezer
 
Posts: 68
Joined: Thu Jan 16, 2014 4:09 pm

Re: Compressor to Hand Pump Airleak Question

Postby ladra » Sat Nov 15, 2014 5:35 pm

Good post!

I had the same problem just now when I was trying the boost mod. There was so much air leak that I couldn't even feel/see any difference with the air tank attached. After putting a bit of Teflon tape, the pump was dramatically different.

I'd like to point out something for other new users, the tape should go just beneath the hex part of the nut. There is no thread at that point... Took me a minute to figure out where I was suppose to put the tape... :lol:

In fact, not need to completely remove the nut, about 5 turns, just enough for you to wrap some Teflon between the gap.

Good luck!
ladra
 
Posts: 4
Joined: Wed Nov 12, 2014 7:57 pm


Return to Tanks & Pumps

Who is online

Users browsing this forum: No registered users and 5 guests