Lift Pump PSI and MPG

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03-18-2005, 08:45 PM

mini14

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Lift Pump PSI and MPG

Ive read that u will get better mileage with higher psi. Is this true ? if so Why......

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03-18-2005, 08:55 PM

Geico266

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Not true. Stock fuel PSI has no effect on mileage.

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03-18-2005, 08:58 PM

Whitmore

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Prolly what you read was when someone had a L/P only makin a few pounds of psi and when they replaced it the milage went up or back to normal

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03-18-2005, 09:00 PM

smokindog

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I've been told that as low as 4PSI is okay at WOT, but have also read here that anything below 8PSI calls for attention to the lift pump. I don't use mine anymore since the FASS.

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03-18-2005, 10:07 PM

mini14

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yes but why?

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03-19-2005, 05:39 AM

Geico266

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Quote:

Originally posted by mini14
yes but why?

Not sure what you are asking. I assume you are responding to the post about abnormally low fuel pressure causing poor mileage. Without designed levels of fuel pressure the injector pump is not running as designed, then not fueling the engine as designed.

What is it about this you are having trouble with? Please be specific.

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