How to remove 360 rollover valve quick release fittings

I’m replacing all my perishing hoses including the fuel tank rollover valves.

I cannot get any of the black quick release fittings to separate. One is missing tabs so I’m guessing this isn’t the first time someone has had a go.

This is what they look like:

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Does anyone have any tips on how to get these off? I cannot remove any of them.

 

For anyone reading this in the future who’s struggling with the same problem, I got the quick releases off by using the right tool - a set of fuel line disconnect pliers.

they still didn’t come off easily but they came off.