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Re: 99 3.8 mustang fuel pressure out of spec by 5 psi low
Posted to Technical Discussion Forum on 2/15/2002

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Hi Mark, The regulator should be adjusting fuel pressure to 30-32 at idle with full vacuum, and with low/no vacuum should go up 10 psi. Pressure should remain above 25 or so when shut off. Ford doesnt... Login to read more.