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Hope I can help Earl.
N.B. In order for there to be a negative pressure in the fuel tank the spring loaded integral relief valve in the fuel cap would have to be faulty and this is unlikely.
It would appear from your remarks that you have positive pressure, in which case you should investigate the Purge control solenoid valve. This is in the circuit of a tube which runs to the throttle body. If removing this tube from the canister releases the pressure you are on the right track. In the event that pressure is released leave the tube disconnected until you are able to fix the problem. The only effect will be to allow fuel tank fumes to be released into the atmosphere
I can assist you with suggestions re checking the solenoid valve if you shout.
Going on what you have reported it appears unlikely that the roll over valve is causing the problem.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
Last edited by Trevor; 09-08-2003 at 08:01 PM.
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