I have a 2011 Nissan Sentra thats smells like gas once in awhile.
Smell Exhaust Fumes in 2000 Astros Van
Leaking axle seal (output shaft seal)
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If you have water leaking into your car, it's a good possibility there is a simple fix.
Your car leaks and you're not sure what's leaking, you're starting to panic.
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Gasoline Smell in Car, 5 Common Causes