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On autos, in-tank pump is typically in a well and intake hose is situated at top of well. So even when it starts sucking in air at low-levels, body of pump is still submerged in petrol.
On my Porsche, pump is external to tank without cooling bath. And it even has foam wrapper around it to lower noise levels.
So I guess it's possible to design petrol pump that doesn't require surrounding petrol to stay cool. Not sure what design differences are...
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