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Depends on the size of the gas tank and when it trips. One car I had trips at 1/8 tank, another at 1/4 tank. I would not count on more than 30-50 miles. If you run a fuel pump with the tank low for very long, the pump can run hotter and it will shorten its life. It depends on the fuel around it to keep it cool. That's why I don't let my cars get under 1/4 tank, and I usually get 200,000 or more miles from each pump.