Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Junior Member
    Join Date
    Jun 2008
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Is my pump broken?

    I have an Avenir floor pump that I've been using with my presta valve-equipped bikes for probably over 10 years now. It's got a Silca head on it with a brand new seal. Earlier today I successfully inflated a road tire, the proceeded to attempt inflation the tires on a cruiser for my wife (it has presta valves too) to no avail. I then tried pumping up the tires on three different bikes, but no dice. I'd put it on a tire and pump, and the pressure gauge would go up then go back down. If I let go of the handle, it'd shoot up to a higher position like the pump was holding pressure but none was going into the tire. I could not hear any leaks from the pump. When I put my thumb over the hole on the head and pumped, I could feel air coming through. At first I thought this was just due to old presta valves on some of my tires, but I moved around to different bikes and newer valves and had the same problem. And yes, I did loosen/push down on each presta valve before attempting inflation. Is my pump hosed? The behavior strikes me as kind of odd.

  2. #2
    Pseudo Retro Grouch bici_mania's Avatar
    Join Date
    Nov 2012
    Location
    Not In Texas
    My Bikes
    Olmo San Remo
    Posts
    468
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Sounds like you have a leak somewhere and I would guess there is an O ring that needs replacing somewhere.
    Life is like a ten speed bicycle. Most of us have gears we never use. - Charles M. Schulz

  3. #3
    Sophomoric Member Roody's Avatar
    Join Date
    Jan 2005
    Location
    Dancing in Lansing
    Posts
    20,575
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    It doesn't sound like a leak to me. It sounds like the air is being compressed, but it isn't getting into the tire. I would check the distal end of the pump.


    "Think Outside the Cage"

  4. #4
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,897
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Roody View Post
    It doesn't sound like a leak to me. It sounds like the air is being compressed, but it isn't getting into the tire. I would check the distal end of the pump.
    That's what I think too. I'd "burp" the little stem on the presta valve. That usually solves the problem you describe.

  5. #5
    Senior Member WonderMonkey's Avatar
    Join Date
    Mar 2008
    Location
    Vandalia OH
    My Bikes
    2011 Cannondale Quick 5, 2014 Raleigh Revenio 2.0
    Posts
    2,300
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    When I had this issue I thought my pump was busted. Then down towards the base of the pump I noticed a knob so I tightened it. Problem solved. I don't know what that knob is really for, maybe to oil the pump or something, but when it was loose all the air escaped through it. Check down at the base for something like that and make sure it is finger tight.

  6. #6
    Junior Member
    Join Date
    Jun 2008
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Retro Grouch View Post
    That's what I think too. I'd "burp" the little stem on the presta valve. That usually solves the problem you describe.
    I burp the stems every time, and mentioned that in my original description. Still no dice. I agree that it seems like the pump is compressing the air, yet it does come out the end of the pump head when it's not attached to the valve. Weird.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •