TrailBlazer 2002-2009
2023- The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

Strong gas smell only when tank is LESS than 1/4 full

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Old Apr 24, 2023 | 11:33 AM
  #1  
rossww's Avatar
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Default Strong gas smell only when tank is LESS than 1/4 full

Good morning!
08 TB 4.2
I have a strong gas smell when the gas tank is LESS than 1/4 full. When I fill to anywhere above 1/2 a tank, the smell is gone.
I've heard of the reverse; fill the tank and there's a gas smell (leak in upper area of gas tank)..
The smell is strongest at the left rear door (NOT at gas cap).
Any suggestions?
Hopefully I get some quick answers as I've also got to replace some exhaust parts and I'm pretty certain that gas fumes and sparks won't have the result I'm hoping for
Btw, there's no fuel Mark's on the ground and no codes showing anything related to fuel delivery, only faulty coolant sensor.
Thanks!
Ross

Last edited by rossww; Apr 24, 2023 at 11:35 AM.
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Old Apr 25, 2023 | 12:21 AM
  #2  
oilcanhenry's Avatar
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Joined: Oct 2017
Posts: 4,605
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From: USA
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Originally Posted by rossww
Good morning!
08 TB 4.2
I have a strong gas smell when the gas tank is LESS than 1/4 full. When I fill to anywhere above 1/2 a tank, the smell is gone.
I've heard of the reverse; fill the tank and there's a gas smell (leak in upper area of gas tank)..
The smell is strongest at the left rear door (NOT at gas cap).
Any suggestions?
Hopefully I get some quick answers as I've also got to replace some exhaust parts and I'm pretty certain that gas fumes and sparks won't have the result I'm hoping for
Btw, there's no fuel Mark's on the ground and no codes showing anything related to fuel delivery, only faulty coolant sensor.
Thanks!
Ross
Likely a shot Carbon Canister system. Dont allow less the 1/4 tank as it can damage your fuel pump if its too low,
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