^ Yeah, on the valve wrenches.
I do a purge first, then install new filters.
If you don't hear anything when you open the fuel cap, especially on a low tank that means the vent is not obstructed, nothing to do with the screen. If you leak fuel out of a closed cap during a left turn, replace the seal. If you're not getting fuel to the engine, check the screen, especially on a low tank.

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