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Why is stock fuel pressure 43.5 psi?

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Old Aug 13, 2003 | 08:50 PM
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Crufty Dusty's Avatar
Crufty Dusty
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Why is stock fuel pressure 43.5 psi?
I noticed this is the figure for many EFI engines. Could someone be kind enough to explain why? Thanks.
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Old Aug 13, 2003 | 10:06 PM
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That's because that is what the industry standard rates fuel injector flow at, 43.5psi.

But I think most engines fuel pressure is set at 40psi.
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Old Aug 14, 2003 | 02:45 AM
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Crufty Dusty
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Perhaps to be more specific then.... is there a reason why the "industry standard" is 43.5 psi instead of, say, 38.5 psi?
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