Question for techs

[Ryan Rønning]

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.

[jesilvas]

Maybe flow or pressure test. I know I know, not a tech. But givin it a and just throwin that out there.

[trevor95f350]

is it electric or mechanical?

[Ryan Rønning]

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

[sea71]

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?

[trevor95f350]

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

[Ryan Rønning]

Originally Posted by sea71

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.

Originally Posted by trevor95f350

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.

[Ryan Rønning]

Bumping this up.

[Ryan Rønning]

Again with the bump!

[excursionMark]

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