1997 Chevy Suburban a clank or pop after I shut off the bur

Tiny
KMBRYAN
  • MEMBER
  • 1997 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 208,000 MILES
Each and every time I shut off the burb, wait about 5 minutes and it will make a noise as if the gas tank is expanding or something. I did purchase a new gas cap and I have been using unleaded +, and have on more than one occasion put gas additive in to clean it up. But this problem has been going on for over a year even prior to me doing anything to it. I can shut off the burb in the garage and walk into the house and 5 minutes later I can hear the pop happen, it's as if you take a can and bearly crunch it then fill it up again and hear it expand. What would cause this?
Thursday, January 21st, 2010 AT 8:01 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,569 POSTS
The pump does create a strong vacuum. However, there is a one way vent that should allow air to be drawn into the tank but not allow air out. I believe it is located on the rear of the tank near the axle. Check that to make sure it is allowing air to enter the tank as needed.
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Friday, January 22nd, 2010 AT 11:19 AM

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