Fuel Pressure drops to 35psi at WOT

[amb82]

I just bought my 06 F-250 a couple weeks ago and have been reading a lot to try and get up to speed. Coming from a 6.4 I have a lot to learn. I have read a few post of people having fuel pressure issues at wot. So I decided to see what mine dropped to at wot. It was 65 normal driving and dropped to 35 at wot. From what I have read this is not good for your injectors. I currently have the plus plus tune loaded and according to the previous owner it has the banjo bolts and upgraded blue spring. What can I do to correct this or trouble shoot this problem. The truck has stock injectors, powermax turbo, and stock fuel pump. Filters were changed about 7,000 miles ago.

[NYC F-350]

Doesn't sound like it actually has that blue spring upgrade done to it. The upgraded spring kits raise the pressure to right around 70psi.
Try changing the fuel filters.........

[amb82]

The guy I bought the truck from said the fuel pressure gauge was one out of his old race car. Maybe a bad reading? I did notice that this is the only gauge that does not light up at night

[NYC F-350]

Get another gauge and check it out. I wouldn't drive it too much until I knew what the pressure was. That low can get expensive quick.

[amb82]

The pressure doesnt budge just daily driving. Only drops when I stomp it

[amb82]

I guess I will start with the filters and gauge and go from there.

[forddieseldoctor]

I would put a known good gauge on there and verify that it doesn't drop below 45 @ wot. If it's low then there is the new fuel pressure regulator. Otherwise if it's low the first thing that you should do is replace the fuel filters. You may also have an inlet restriction to the pump on the frame rail, or a fuel pump that is dying, or a plugged fuel filter due to crappy dirty fuel.

[amb82]

Originally Posted by forddieseldoctor

I would put a known good gauge on there and verify that it doesn't drop below 45 @ wot. If it's low then there is the new fuel pressure regulator. Otherwise if it's low the first thing that you should do is replace the fuel filters. You may also have an inlet restriction to the pump on the frame rail, or a fuel pump that is dying, or a plugged fuel filter due to crappy dirty fuel.

You said there is a new fuel pressure regulator. Is this a aftermarket regulator or a redesigned factory one?

[forddieseldoctor]

Redesigned oem one. That may be what is being referred to as the blue spring. I don't remember what color the new spring is.

[sinner6.0L]

updated factory part 3c3z-9t515-ag