By the way, the icon is supposed to depict the fuel filter, with fuel inlet at the top, and the wavy lines is the water sitting at the bottom of the filter (water being denser than diesel it sinks).
To put your mind at rest you could try opening the siphon valve on the bottom of the fuel filter and pumping the fuel pump grenade a few times (collecting remnants in a container for examination).
The sensor works by checking the conductivity of the fuel. If you add fuel additive this obviously affects it (as does water), hence the occasional flicker of the light.
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