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Knocking noise under hood

Tiny
TIFFNICOLE
  • MEMBER
  • 2010 HYUNDAI ELANTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 151,032 MILES
Recently I accidentally left my gas tank open in the rain for about twenty minutes. I am not sure if water got in it or not but ever since then my car has been making a loud knocking noise when turned on. What could this be?
Friday, September 28th, 2018 AT 8:20 AM

1 Reply

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

That is possible that water did get into the tank. Water is not combustible so that could explain the "knocking" sound under the hood. I would suggest having the fuel system flushed and put in fresh gas. There is an additive call"Seafoam" that might help in the meantime but definitely you need to get the contaminated gas out. I have attached a picture of what the can looks like. Hope this helps and thanks for using 2CarPros.
Danny-
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Friday, September 28th, 2018 AT 2:15 PM

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