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What causes a fuel "tank" to lose pressure?

My van failed emissions today, says that the fuel tank is losing pressure. EVAP test over cutpoint is what it says. measured .67 limit is .40. What causes this?
The fuel cap was tested on and off. Fuel cap is not problem. This is CALIFORNIA By the way. lol

there is a line that runs from the fuel tank to the engine bay that goes to the charcoal canister, it may be severed this is where the pressure comes from.

This entry was posted on Friday, November 13th, 2009 at 4:18 pm and is filed under fuel emission. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

3 Responses to “What causes a fuel "tank" to lose pressure?”

  1. Fuel cap.
    References :

  2. yes, as he said the fuel cap can cause the leak but im sure the shop tested out that theory when it failed.
    take it back to the shop and have them test the evap system.
    unless you are properly equip ed there is really no way you can test it yourself.
    References :
    Im a Mechanic

  3. there is a line that runs from the fuel tank to the engine bay that goes to the charcoal canister, it may be severed this is where the pressure comes from.
    References :

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