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Fuel tank pressure not equilizing......
1999 Chevrolet Tahoe

Fuel Tank pressure not equilizing......

(1999 Chevrolet Tahoe)
I get "popping" sounds every so often coming from the tank I would guess, mostly during big ambient temp changes, or depending on how the fuel tank pressure stabilizes. The popping sound is almost a metallic sound though. I don't have any engine faults, and google hasn't helped with searches as to the sensor / equilizer in the tank. I looked at the plastic lines that run from the lower portion to the higher portion of the tank and they seemed okay. Any help is greatly appreciated! Thanks
2 answers & 2 comments
Popular Answer
on April 15, 2010
It is not unusual for the muffler heat shield to be loose causing a popping sound from the rear of your 1999 Chevrolet Tahoe. The fuel tank is plastic so I would not think a metallic popping sound would be coming from there.
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on April 15, 2010
The Metallic popping sound is most definitely due to a "pressure equilization" of the tank. Is there a way this tank does equilize the pressure either between the various levels in it, or to the atmosphere? I have googled and cannot find any info on it. I know the tank is plastic, maybe it is has something to do with the tank pressure on the straps. I am a car guy and have done various work on vehicles, but am not sure of the defaults in this tank / fuel system design and how it equilizes the tank pressure.
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on April 15, 2010
It is not unusual for the muffler heat shield to be loose causing a popping sound from the rear of your 1999 Chevrolet Tahoe. The fuel tank is plastic so I would not think a metallic popping sound would be coming from there.
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on April 15, 2010
The Metallic popping sound is most definitely due to a "pressure equilization" of the tank. Is there a way this tank does equilize the pressure either between the various levels in it, or to the atmosphere? I have googled and cannot find any info on it. I know the tank is plastic, maybe it is has something to do with the tank pressure on the straps. I am a car guy and have done various work on vehicles, but am not sure of the defaults in this tank / fuel system design and how it equilizes the tank pressure.
on July 18, 2010
I hear this sound too sometimes from my 2000 Denali (kinda the same as the tahoe, structure wise). I was also curious what it is. If you find out for sure, please follow up and post the findings!
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I am not sure, as now I have a P300 random misfire, repaced intake valve, checked compression, working on electrical, egr, etc.... But I think your issue should be purge valve needs replacing. a $40 part.

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