Fuel pressure (not sure if its a problem) - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 03-26-2010, 06:14 AM Thread Starter
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Fuel pressure (not sure if its a problem)

I finally got some of my gauges in. My fuel pressure sits at around 50-53 at idle. But under full throttle drops to about 48. It never goes over 55 that I have seen. New Ford filters a couple weeks ago... I've read 45 is the max on the low side, and I'm close. But I've read others up to 60 or so in the high side. I have no tunning yet,or chips so I wonder if this is normal for stock.

05' F-350 Crew cab, Long bed, FX4, 6.0, Lariat..
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post #2 of 4 Old 03-26-2010, 06:19 AM
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ford spec is 50 psi +/- 5psi, so you are within spec of optimal fuel pressure.

Adam Brannan

First Coast Diesel Performance


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post #3 of 4 Old 03-26-2010, 06:27 AM
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Ford spec as per the latest & greatest PC/ED Performance diagnostics worksheet is F-Super Duty/Excursion 310 kPa (45 psi) MIN - 503 kPa (73 psi) MAX.

This is tested at full load/WOT or using the proper Rotunda SST with the special calibrated orifice to simulate full load.

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post #4 of 4 Old 03-26-2010, 06:29 AM
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There is a new fuel pressure regulator available for the 6.0, 3C3Z-9T517-AG. It comes with a blue spring and bumps fuel pressure to around 70psi, 50-55psi with the test tool (as mentioned in the above post) valve open. Hope this is of some use to you. Typically I will put a small ball bearing under the spring, or put a different spring in it should I be able to find one that fits well and doesn't put the pressure through the roof.

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