i have a 99 civic ex auto.

I am having trouble starting it up. I wanted to ask for some help. The car has always ran great. it has 160K miles. Car is stock.
The trouble started two nights ago. I was at my GFs house and they have 5 gallon gas tank inside the garage. The gasoline in it has been there for a months, i think like 5 months. Well we poured about a gallon into their Santa fe and the rest into my civic. I had about half a tank of gas before i added any gas. Their Santa Fe wouldnt start up the next day, it woudl just crank. it eventually started and it smoked for a second(whitish smoke). Then I checked my car to see if it had the same problem. It cranked up just fine and then i turned it off; Later that night I started it up and ran fine for a few seconds until I put it in reverse and the car shut off. Ever since, the car hasnt been able to start up.

I am thinking something was wrong with the gas and it screwed up my fuel pump or something in the fuel system. But i am unsure, it just cranks and cranks but doesnt start up....like you're trying to start the car with low gas. Today I put a cheveron fuel system cleaner in to see if it would help but it still doesnt start up.

anyone have any ideas.
thanks a lot for the help guys!

try replacing the fuel filter, could have got clogged. or if the gas had a mixture of oil/gas that might cause it not to start. good luck

thanks for the help
bump for anymore ideas

thanks!

bump for more answers

check ur fuel filter cause when u run the car low on gas or put shitty gas in it will clog it instantly