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stock 86 GN with stock fuel pump & Bosch -233 fuel pressure regulator (fpr) should be 38-40 psi at idle with the vac line off at the fpr. it will drop to 28-30psi with the vac line connected. The fp should be 51-54 psi at wide open throttle. you will need to connect a fp gauge where you can see it when you drive when you test full throttle

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Q: What is the fuel pressure setting for a 1986 Buick grand national?
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