ran out of gas put 4gallons in tank but wont start. Battery died trying. help

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when i tried to start it after putting 4 gallons in tank it would just crank but never started. I tried first to start it and not hit the gas pedal then when it didnt work that way I tried pumping it a couple times still nothing. Is there something I dont know that I need to do before I tried starting it after I ran out of gas then put 4 gallons in tank. Please help...