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SN95 Cobras
Overly rich
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<blockquote data-quote="mwolson" data-source="post: 14879377" data-attributes="member: 16006"><p>Your fuel pressure should read about 29 PSI at idle with the vacuum hooked up, not 39 PSI. It should read 39 PSI only if you unhook the vacuum from the FPR or at WOT if you are naturally aspirated. It should read 1 PSI over 39 for every PSI of boost you have at WOT for forced induction.</p><p></p><p>The FPR is supposed to keep the fuel pressure at 39 PSI above the relative pressure in the manifold at all times. With stock cams, your idle should be at about 20"Hg. That is about -10 PSI. 39 - 10 = 29 PSI at idle.</p><p></p><p>It sounds to me like your fuel pressure regulator is not working correctly.</p></blockquote><p></p>
[QUOTE="mwolson, post: 14879377, member: 16006"] Your fuel pressure should read about 29 PSI at idle with the vacuum hooked up, not 39 PSI. It should read 39 PSI only if you unhook the vacuum from the FPR or at WOT if you are naturally aspirated. It should read 1 PSI over 39 for every PSI of boost you have at WOT for forced induction. The FPR is supposed to keep the fuel pressure at 39 PSI above the relative pressure in the manifold at all times. With stock cams, your idle should be at about 20"Hg. That is about -10 PSI. 39 - 10 = 29 PSI at idle. It sounds to me like your fuel pressure regulator is not working correctly. [/QUOTE]
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