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fuel tank roll over valve?

This is a discussion on fuel tank roll over valve? within the General Help forums, part of the LSx Technical Help Section category; I was trying to put fuel in my car earlier and it simply wouldn't go in. It would fill up ...

  1. #1
    Junior Member 2CMX's Avatar
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    fuel tank roll over valve?

    I was trying to put fuel in my car earlier and it simply wouldn't go in. It would fill up the filler neck and that was that. After thinking about it i slid a piece of thin etal down the filler neck and pushed open what seemed to be a door that lead into the tank. I asked a chev mech about it and was told it was one of two things the roll over valve or the fuel tank vent was clogged. Any body seen this before?

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    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    there is a check in there to keep gas from pouring out. It could also be your evap vent solenoid sticking too and keeping the tank pressurized.

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    Junior Member 2CMX's Avatar
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    It did have a code; P0440 evap emission control system. I didnt put 2 and 2 together but it makes sense now. When I pushed the door/flap open all the gas in the filler neck was blown out by the build up of pressure in the tank. I haven't had a problem since I pushed it open and releived all the pressure. Guess I'll wait and see if it was an anomaly or if the sylenoid needs replaced. Thanks for the help!

  4. #4
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    If it even happens again you can disconnect the line from the solenoid and it will vent. No tools are needed, its a squeeze type fitting.

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