Question about 2003 GMC Yukon Denali
Hisses when gas cap is opened
Supposed to hiss. There is a pressure sensor on the tank which when bad willl let you know there is a problem. That is why there is usually a warning about fuel spray on the gas cap/lid.
Posted on Mar 08, 2009
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Posted on Jan 02, 2017
I think you have problem in fuel tank ventilation the (EVAP) system do to ventilate the fuel tank and pull up fuel vapor to the engine
may be there is blocked pipe or electrical fault in valve (EVAP system) in engine room
Posted on Jul 02, 2008
no it has a closed system so no smell of petrol so their is something wrong with the suction pump and the pipes that come from teh engine compartment
Posted on Apr 04, 2011
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SOURCE: 2006 torrent po446 code smoke
this could verry well be the gas cap vent broke, even if tightned still broke inside.if the smoke test was done correctly, then this should have been noticed.
Posted on Jan 05, 2011
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