Blue spring or not? - Ford Powerstroke Diesel Forum
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Old 03-03-2012, 05:50 PM
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Blue spring or not?

Just added fuel pressure gauge today. Got some results I wasn't expecting. Didn't matter whether I was idling or running at highway speeds it maintained a steady 52 to 54 psi. So do I add the spring upgrade or leave alone? If add then what is everybody seeing on average as a increase? I don't want to go to high.
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Old 03-03-2012, 05:55 PM
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How was the reading when you went WOT with it? Like jumping out into traffic, or just having fun?
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Old 03-03-2012, 05:57 PM
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That's when it would be on the low side of 52.
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Old 03-03-2012, 06:03 PM
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Most are concerned at 45.
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Old 03-03-2012, 06:16 PM
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Here is a thread. A tech in this thread mentions 48 being a concern, 45 and below a problem.

GDS FUEL SPRING UPGRADE - Ford Truck Enthusiasts Forums
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Old 03-03-2012, 07:24 PM
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A well known injector supplier (Full Force Diesel - Casserly Injectors) recommends being over 50 psig at all times. I found that interestting.
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Old 03-03-2012, 07:41 PM
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I'd say blue spring. mine runs 75 at idle. And 65 at wot


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