99 f250 7.3 L blowing white smoke and loss of power

[mxhiggi911]

My f250 started acting up a couple of months ago. First going up hill. The more throttle I gave it the slower it got. Finally got to where it would only do about 20 - 30 mph. Turned it off for a few min then started it back up ( thinking fuel filter ). It ran better. Was able to drive 60 miles back home at 60 mph. If I gave it throttle hard it would bogg down and I would have to do all of this again. I changed fuel filter under the hood. It fixed the problem for a couple of weeks. Started doing it again off and on. Then I noticed that it was only doing it when the fuel got down close to a quarter of a tank. Now I am seeing white smoke when I give it hard throttle and loss of power. It is getting worse every time I run it. I also drained the water separater behind the fuel filter. That did help, but it started back up. i am not seeing any black smoke at all like normal. A little history, I was running used cooking oil and diesel 50 50. Did that about 6 months. The truck ran better than ever. I was unable to get the bio any more so I went back to straight diesel. About 6 months later is when all of this started. I am again back to running 50 50 again. It has just now started getting cold here in Alabama. So I am running 60 diesel and 40 bio. As far as I know, the truck is all stock. have not noticed any drop in coolant. Thinking cracked head or blown head gasket. i was told that it could be the screen in the tank. Also was told that it might be the egr sensor? Any help. I'm running out of ideas. I can do most of the work myself. As long it doesn't get very deep. I'm new to working on diesels. I work on bikes and small engines. I am getting my bio from a licensed waste cooking oil recycler. It is very clean. I know a lot of people running it with no problems. Any ideas? Help please

[jesilvas]

No egr at all.
I'd pull the tank to make sure it's clean

I made my Samsung SGH-I997 send this.

[mxhiggi911]

Thanks. Haven't looked into that yet. Is it much trouble to do. Have I got to take off the bed. Or can I drop it from below. Do u think cooking oil has any thing to do with it?

[jesilvas]

Yea, possibly. I know that it needs to be filtered a lot and centrifuged. Not just dumped straight in with diesel.
You can either raise the bed or drop the tank.

[mxhiggi911]

I agree. The oil is ran through a centrefuge. It is filtered down to 1 micro ??. The oil is ran through every filter out there and heated and separated. So I can just drop the tank. Wasn't sure if I would be able to do that without pulling the bed. Thanks