Question about 2002 Ford Expedition

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My check engine light comes on. took it to a parts store and the problem was either a faulty gas cap or something in the fuel system dealing with it pulling a vaccuum. sometimes when i pull the gas cap, there is definitly a vaccuum, other timesd there is not. sometimes the light goes out, sometimes it stays on. i know the gas cap is good, what else causes the system not to pull a vaccuum?

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  • yadayada
    yadayada Aug 06, 2010

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You have a vent solenoid and a purge solenoid and a gas tank pressure sensor and a charcoal cannister, you also have vacuum lines, fuel cap, filler neck and the fuel pump seal itself which can all have a small leak.

So what a shop would do is apply a slight bit of pressure using a smoke machine so as to see where smoke leaks out. Also they would check the other parts for proper function. If everything checks out then in some cases a reprogram for the computer is the only fix.

Posted on Aug 07, 2010

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VAPOR MANAGEMENT VALVE STICKING

Posted on Aug 06, 2010

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I have a 2005 gmc yukon with gas fumes coming from fill tube area. No visible leaking.


you open the fill door and you smell gas?

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You wouldn't think a gas cap would be that important, but it is. When it's loose or cracked, fuel vapors leak out and can throw the whole fuel system off. This causes a reduction in gas mileage and increases emissions.
What causes it: If you get an error pointing to the gas cap it means fuel vapors are leaking out of your cap. This means the cap is either cracked or just wasn't tightened well enough.
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