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How can you tell if fuel reg is bad.

(1990 Buick Century)
in Milwaukee, WI on April 28, 2015
when i turn the key on my gauge reads out at 46 pounds but car will not start.
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on April 28, 2015
if the regulator has a vacuum hose attached to it,check for leaks in the hose,cracks,splits,dry rot.pull the hose off the regulator,if any signs of fuel in vacuum hose,replace the regulator,it's bad.
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