Fuel pressure drop at WOT after 60mph - Ford Powerstroke Diesel Forum
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Old 05-07-2013, 03:18 AM
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Fuel pressure drop at WOT after 60mph

Just replaced my HFCM (fuel pump) on my 2003 6.0 cause i thought it would fix my fuel pressure dropping after 60 mph, My fuel pressure fluctuates at idle between 63-66 and after WOT from a stop drops to 55 then after 50-60mph(still WOT) starts dropping past 50psi,Any suggestions? I have the blue spring with a bb
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Old 05-07-2013, 03:51 AM
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Fuel filter???

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Old 05-07-2013, 04:53 AM
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^ +1, I noticed a substantial power increase with good filters. But if you are running oversize injectors that are not listed you need a bigger fuel system. Also try a regulated return if the filters are good.

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Old 05-07-2013, 05:25 AM
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i Juts changed my fuel filters about 1000 miles ago and stock injectors, and no tune, thats why im confused?
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Old 05-07-2013, 05:30 AM
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Filters are motorcraft
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Old 05-07-2013, 11:17 AM
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Another note: the fuel pressure gauge reads 0 when i turn the key on and i wait for it to build pressure (66 psi) every time before i start it, so it seems like it wont hold any pressure when sitting for 5 minutes (off) , I dont know if this is normal but i dont think it should be
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Old 05-07-2013, 08:36 PM
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Exactly how are you readinge fuel pressure a aftermarket gauge of some kind.
No 6.0 ever built came with a fuel pressure gauge.

Fuel pressure bleeding of after a few minutes is normal, it is why the fuel pump comes on when you turn on the key and why your owners manual says to wait a few minutes before starting the truck that and a few other things to complete their cycles.
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Old 05-08-2013, 04:10 AM
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I am using this gauge
square fuel pressure Gauge, velcro anywhere, size of a keychain remote. Digital fuel pressure gauges in a square package will read fuel pressure in PSI. - square fuel pressure Gauge, velcro anywhere, size of a keychain remote
I know another forum member is using this same one

I agree with you, but after the pump shuts off it doesnt hold any pressure it drops to zero very fast, the pump is also louder then normal (motorcraft)

I just think it should hold some amount of pressure and with a new pump i would of expected my fuel pressure to be higher then it was and its the same 66 at idle and 57 at WOT
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Old 05-08-2013, 08:56 PM
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Does the 2003 fuel tank have the filter set up in it?? Also 57 psi at wot is good pressure.
Did you look at the condition of the fuel poppet in the regulator. may have some damage in the seat ?
Again the pressures you are seeing are not really bad, but you are squashing the blue spring.
Does the fuel pressure drop the longer you drive it? If so look into the tank filters if so equipped.
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Old 05-09-2013, 06:52 AM
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On mine, once the fuel pump shuts off the pressure bleeds down to zero pretty quickly. I think it is normal.

MikeB
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