The plumbing of your regulator must be putting your supply fuel to your F/I unit on the low pressure side (return side). An air hose blowing into your gauge would tell if it's bad.
Of course I am just stating what others have already...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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