sounds like the vacuum you have it hooked to is ported vacuum; picks up the source above the throttle blades instead of below. But you say it didn't used to be that way, so that shouldn't be the issue.
The only other thing is if the fuel is too hot the pressure will drop. Also a dirty filter will drop pressure, but usually it will still be better when the vacuum is low, not vice-versa.
Jody
Last edited by camcojb; 05-24-2009 at 01:49 PM.
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