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Fox Body Mustangs
Extremely rich and rough idle
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<blockquote data-quote="Mustang5L5" data-source="post: 16478450" data-attributes="member: 38517"><p>Check valve in the pump has failed. Car should still run though. I had a failed check vskve for years without any other issue. </p><p></p><p>but, key on prime should build pressure. Should spike to 39psi instantly. Cycle the key a few times. See if you get 39psi</p><p></p><p>while running oressure should be around 35-36psi and spike to 39psi when you blip the gas. If you unplug and cap the vac line, you should have 39psi. Smell the vac port on the regulator. Does it smell like gas ?</p><p></p><p>If you are only getting 30psi you should investigate that. Possibly a bad regulator and I’ve seen a split hose on the fuel pump Hanger in the tank cause similar issues</p></blockquote><p></p>
[QUOTE="Mustang5L5, post: 16478450, member: 38517"] Check valve in the pump has failed. Car should still run though. I had a failed check vskve for years without any other issue. but, key on prime should build pressure. Should spike to 39psi instantly. Cycle the key a few times. See if you get 39psi while running oressure should be around 35-36psi and spike to 39psi when you blip the gas. If you unplug and cap the vac line, you should have 39psi. Smell the vac port on the regulator. Does it smell like gas ? If you are only getting 30psi you should investigate that. Possibly a bad regulator and I’ve seen a split hose on the fuel pump Hanger in the tank cause similar issues [/QUOTE]
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Extremely rich and rough idle
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