Yes. a 4:1 FMU will add 4 psi of fuel pressure for every psi of boost on top of the static (zero vacuum zero boost) setting of your fuel pressure regulator. So if your "vac line off" fuel pressure is 38 psi, and you see 10 psi of boost, fuel pressure will spike to 78 psi.
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Craig
Supercharged 93 GT
"I drive way too fast to worry about cholesterol!"
Then I went to the doctor.... whoa 312! Hello Lipitor
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