Question about 2005 GMC Envoy

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Gas cap suction - 2005 GMC Envoy

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Thats a good thing. Means your fuel system , which is pressurized, is working ok. If it doesn't have suction, it may cause your check engine light on. unless it's causing problems, leave er be good luck hope this helps you. Cheers from Nova Scotia!!

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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Radiator goes into the overflow reservoir, but it doesn't get sucked back into the system when it cools


If the radiator pressure cap is good and is sealing correctly then two possible scenarios present.

The first is the return valve of the pressure cap is providing too much resistance so instead of the expanded liquid being drawn back in as the engine cools, all the hoses shrink a little by the equivalent of the expelled coolant.

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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

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Check engine light came on and they said it was vacuum problem and it waste gas - what can or how can the problem be fixed. It is also squealing - they replaced the trolley pulley and it started to squeal...


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1 Answer

The engine runs fine until it get to half a tank of gas.


I wonder if it could be that the tank's not getting vented properly... have you tried just taking the gas cap off and replacing it, without adding fuel? is there a suction sound when you take the cap off?

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92 dodge caravan


HI..
I'm sorry but Not a drain plug is availabe. on that model of van.
You need to remove the filling hose to take out some fuel.

OK. Be careful I hope this work for you.

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