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1999 Chevrolet Tahoe

Question: Fuel Tank pressure not equilizing......

Question

Visitor, 5.7L V8, Stanwood, WA, April 13, 2010, 13:20

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

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  • Answer #1

    Oakman April 15, 2010, 12:17
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     Master

    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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    jpkeys368, April 15, 2010, 12:27
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     Rookie

    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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  • Answer #2

    OBSdenali July 18, 2010, 07:43
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     Enthusiast

    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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    Visitor, July 19, 2010, 06:37

    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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