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  • It depends on how it's built. As with a lot of questions, we really need a photo or an indication of brand and model. Commented Oct 17, 2022 at 18:19
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    My dad would say you can't make it worse than it is, so you might as well take it apart and have a go at fixing it. Commented Oct 17, 2022 at 18:20
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    The check valve in the pump is leaking. Not screwing the pump all the way on lets the tire valve behave as a (somewhat flaky) check valve. Commented Oct 18, 2022 at 1:34