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rail pressure is 28 to 35 psi....pump pressure is is higher ,airtex e 2000 for example is aprox 95 psi but your rail fuel regulator just sends the left over fuel back to the tank..if you us a pump that is to low in pressure the engine will starv under load.

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15y ago
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Q: Fuel pump pressure on 1989 ford f350 7.5l?
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