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    I'm hoping that changing manometer to pressure gauge is helpful and not just a reflection of my lack of knowledge of English usage outside of the US – I think of a manometer as being one of the 'U' shaped gauges where you read a column of liquid to measure pressure. Commented Nov 25, 2015 at 17:15
  • What happens if you take the pump off (after pumping the tire up so that it is reasonably hard) and then put it back on? Do you get the same reading? Also how big are your tires? One difference between trying with a tire and blocking with your thumb is that the volume of air involved is much smaller. Commented Nov 25, 2015 at 17:18
  • Yes, when I take it off it shows 0 psi. When I put it again it shows again 20 psi... Commented Nov 25, 2015 at 17:32
  • 1
    Our chat session suggests its a dodgy gauge. Recommended to return pump for replacement, but its a cheap website purchase with no return policy. Suggested to test tyre pressure against a known good air pressure gauge and compare readings. Commented Nov 25, 2015 at 20:51
  • 1
    A cheap mechanical dial gauge is 10-15 dollars. It is a good idea to check any gauge against a couple of other probably accurate gauges (possible on pumps) at home and/or a bike store. When I did that I discovered my home pump (from P******e) was showing 15 psi over true psi, but the mechanical dial gauge is got for $10 was accurate. Commented Nov 29, 2015 at 1:22