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Back pressure on foot pump(6 posts)

Back pressure on foot pumpKramer7
May 13, 2003 12:37 AM

I have just finished repairing the base of my foot pump, which had a few hole around it.

But now when I go to pump up my tyres, I push down up the handle be is just comes back up due the back pressure.
Now can I fix this problem.

Cheers Kramer
Are you sure you put it back together correctly???biknben
May 13, 2003 4:50 AM
Did your "repair" have anything to do with it. Maybe you didn't reinstall the parts correctly.

Let us know what brand of pump it is and someone may be able to offer more help.
re: Back pressure on foot pumpcurlybike
May 13, 2003 5:07 AM
There is a check valve in the base that prevents back flow. It is either sticky or dirty or assembled improperly. Check all those points and you should find a problem.
Off the top of my head, I'm guessing....cory
May 13, 2003 7:45 AM
The thing's got to have some kind of flapper valve in it that lets air flow one way but not the other. If you took it apart that far, I'm guessing you put the valve in backward. But I've never taken a pump that far apart, so it's only a guess....
Another possibility is that something loose in the barrel got wedged against the outlet to the hose, and air pressure has jammed it down in there.
re: Back pressure on foot pumpmackgoo
May 13, 2003 9:45 PM
It probably is related to your "rebuild" but one other thing to check. I find that the tire valve on my bikes stick closed. I've finally just taken a nail or somthing else that can fit in the valve extender and push the valve open to cycle it off it's seat. Then I pump up my tires. Prior to doing this alot of time I would experience something like you describe.
Thanks for all the adviceKramer7
May 15, 2003 12:03 AM
Thanks for all the advice.
The pump is a Giant model