It was years ago when I did this, so I can't remember the details, just that it was fairly easy.
If you unbolt the bottle you should be able to shuffle it around to give you more room to work.
The pumps are just stuck into the grommets with the screens as shown above.
I don't remember having much fuss getting the output hoses or connectors off, just working in a tight spot.
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Warning: May contain traces of nuts.
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