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You won't overheat the fuel pump, so go for it as long as you are ok with the hassle of running out.
I put 4.74 gallons into my motorcycle the other day. It has a 4.7 gallon tank, and it was the second time in a row that I ran it out while just barely coasting to the gas station.
I've run my diesel truck out twice, and each time it brought to my attention the fact that my lift pump had died. Can't bleed the fuel lines without a working lift pump, and running without it for long durations will eventually kill the expensive injector pump. So, in these instances it was actually a good thing to run it out.
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