Never had a go at you for the Size of your tank. Your original a was about your gauge not reading right, nothing to do with fuel tank.
I don't know apart from the fsm what size is, I've got wagon and haven't filled it yet

OMG I Have A B310 Its 35Liter From Bone Dry LOL

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Yes B110 has a tiny tank. According to the Datsun factory service manual:

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I only put fsm up. B110 was Tiny.

Zero fs given here about capacity. Bigger tank won't fix the fuel level issue

It's not unfamiliar saying that, it's the Datsun factory service manual. Might be the manual for Canada or UK however ...

UNFAMILLIA Your welcome to Meet me at the fuel station And try to
put 50Liters In my Sunny And the Other 20 will Spill over ground
Ha Ha Now Stop Telling me its 50 L I Have only Had the Car For 7Years

Blasphemy

Could be a problem with the right foot 😉

B310 has 50lt tank in sedan 47 in wagon etc

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Fk mad Datsun I don't Have a lot of $$$ Its No Race Car
And David In Australia Sunnys B310s 1200 and 120ys all have the
small 30litter tanks