Proper fuel pressure specs? 08 5.4L

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yungdeezy

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Can anyone tell me proper fuel pressure specs for 2008 5.4L V8 Expedition?

As a bonus, how low should fuel pressure drop with snap throttle test before you’d think there’s an issue?

Suspecting a fuel pump issue with my expedition but trying to confirm with fuel pressure check
 

Vdubnick

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following... ive read 55-60PSI

im having power issues while under heavy load (trailer up steep grade) and also lower than expected economy issues, even after installing new timing set. There was an improvement, especially when not towing, but it still is not what is was 50k miles ago.

I ran cylinder contribution test, and the line was almost flat, so ive ruled out coils. my next thought is fuel pressure, tho i have measured at idle and IIRC it was around 70 PSI even when flooring it.
 

Vdubnick

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measured mine, idle is it 70PSI, lowest it dropped while driving is 65PSI ... i am assuming that is normal
 
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