Question for techs - Ford Powerstroke Diesel Forum

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post #1 of 13 Old 11-17-2009, 03:41 PM Thread Starter
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Question for techs

How can I confirm that my fuel pump is weak and going out? That is what I think is wrong based on how the truck is running but I need to be 100% sure before I buy one.

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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post #2 of 13 Old 11-17-2009, 03:43 PM
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Maybe flow or pressure test. I know I know, not a tech. But givin it a and just throwin that out there.



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post #3 of 13 Old 11-17-2009, 03:50 PM
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is it electric or mechanical?

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post #4 of 13 Old 11-17-2009, 04:34 PM Thread Starter
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Well I believe it to be the frame mounted electrical pump. Truck runs like its missing. Fuel pres guage is very jumpy even at idle ad will not go over 40lbs

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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Thanks. I'll give er a good wackin in the morning.
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post #5 of 13 Old 11-17-2009, 04:41 PM
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Factory fuel pressure is 58ish if I remember correct. I will see mine drop momentarily to the 40-45 lb range at wot but it quickly comes back up.

Also, where you got fuel pressure gauge tied into?

Shane

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post #6 of 13 Old 11-17-2009, 04:47 PM
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make sure it has 12 Volts going to it than you can ohm it Im just not sure what fords spec is on those pumps I could look it up on all data tomorow at work if you want

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post #7 of 13 Old 11-18-2009, 03:33 AM Thread Starter
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Quote:
Originally Posted by sea71 View Post
Factory fuel pressure is 58ish if I remember correct. I will see mine drop momentarily to the 40-45 lb range at wot but it quickly comes back up.

Also, where you got fuel pressure gauge tied into?
Mine is less then 40lbs at idle. You dont want to know what it is at WOT.

My fuel Gauge is hooked to the port on the back drivers side of the fuel bowl. Thats where ISSPRO's directions had me put it.
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make sure it has 12 Volts going to it than you can ohm it Im just not sure what fords spec is on those pumps I could look it up on all data tomorow at work if you want
I will check that out today.

Project Frankenstein


1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

Quote:
Originally Posted by XPLOSIV View Post
Thanks. I'll give er a good wackin in the morning.
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post #8 of 13 Old 11-18-2009, 04:06 PM Thread Starter
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Bumping this up.

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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Thanks. I'll give er a good wackin in the morning.
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post #9 of 13 Old 11-19-2009, 03:09 PM Thread Starter
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Again with the bump!

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

Quote:
Originally Posted by XPLOSIV View Post
Thanks. I'll give er a good wackin in the morning.
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post #10 of 13 Old 11-19-2009, 03:46 PM
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On 98.5 and newer engines: The newest version of the PowerStroke has an electric fuel supply pump. Pressure readings are taken at the fuel rail plugs at the front of the RH head, the rear of the LH head, and at the fuel pump outlet. The fuel pressure should be over 30 PSI, but anything below 50 PSI will cause an injector knock. If the pressure is low at either head, replace the check valve at that head's fuel rail inlet. If it is low at both heads and the pump outlet, check the pressure regulator at the fuel filter return line for debris or a split o-ring. If the regulator is OK, check for a fuel pump inlet restriction as described above.

got that from PowerStroke diagnosis ... idk if it will help but its someinfo for ya


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7.3L Powerstroke Diesel~DP Tuner (Stock.Drive Thru.High Idle 1400.80 Economy.120 Race)~05 front end~DIY AFE Pro Dry S Intake~Viper Alarm/Remote Start~55w 8000k HID~Whelen Strobes~Pioneer AVH4100~Alpine Type X Component Speakers~2x12” Type X Subwoofers~Alpine PDX 1.1000 Amplifier~Custom Center Console
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