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Although it may be an amusing experiment, it is not something I would be doing. It is actually the fuel in the tank that is used for cooling the fuel pump. Ideally the fuel should be deep enough in the tank to submerge the pump If you are running down to "fumes" odds are that you are not cooling the pump, and it will need to be replaced sooner. If you don't turn your own wrenches, this can be several hundred dollars to have done, and even if you do...it is still inconvenient to have a vehicle down for a $50-100 fuel pump.
I'll stick to filling up at 1/4 tank and figuring my MPG...I don't want to spend what I save on fuel doing repairs...rather do upgrades.
Jim
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