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2018 Outback Limited, 2.5 litre, automatic
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33 Posts
The fuel pump generates a lot of heat when it runs because is spins at pretty high RPM. It's designed to be cooled by being submerged in fuel. When you run your tank low, the pump runs hotter. It's not going to fail the first time you run your tank low... or even the hundredth time. But the more you allow it to run hot, the more you increase the likelihood it'll fail.
 

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Registered
2018 Outback Limited, 2.5 litre, automatic
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33 Posts
No. The fuel pump is cooled (and lubricated) by the fuel running through it. Cooling is independent of fuel level in the tank ... right up until the pump starts sucking air.
View attachment 526148
The heat is generated in the electric motor, not it the pump/impeller area. Things would get pretty exciting, pretty fast if the electric motor was cooled by gasoline. ;)
 
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