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Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

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Old 01-24-2006, 17:20   #1 (permalink)
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Fuel pressure questions

I was testing the fuel pressure on my 1993 Taurus 3.0L. I put the tester on the pressure relief port (an Actron III tester). Started the car and got around 31 psi. My repair manual says it should be 39 psi. Then I tried something....I unplugged the vacuum line from the pressure regulator and the pressure shot up to 40 psi. That kind of sounds backwards to me. If I look at a cutaway of the regulator, if a vacuum pulls on it, the regulator should open more and allow more fuel. Am I missing something here? Is the regulator bad?
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