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[RoGrrr]

so I installed a new fuel filter and drove the truck. It ran GREAT. I was thinking that I solved the problem and drove it to work yesterday (40 miles of freeway each way) and then a couple miles to pick up a big oil tank. It ran great all the way. I'm thinking, "MAN, I'm "in like Flynn".
I picked up the 500 pound tank and drove it home. Still ran great.
I did notice, tho, the EGT ran from 100 to 200* higher than with diesel fuel. it used to cruise at about 600 and now it is up to around 800 on level interstate, changing only the fuel.

So today on the way in to work, I had gone about 25 miles and noticed the RPM climbing but the speedo drifting down. I also think it had come out of overdrive (auto tranny). I felt less and less response from the throttle pedal, to the point, I thought I had run the 50 gallon tank dry. No gauge on it and I have no idea what kind of mileage I'm getting.

I pulled off the pavement and popped the hood to get at the valve (I had installed it under the hood to switch between oil and diesel) to change back to diesel. I have full tanks of diesel and used that as my comparison. It worked and I got to work.

So this afternoon, before I started home, I checked the tank - plenty of oil, switched back to RMO and started the truck. I also pulled the fuel filter and saw that it looked good, not all plugged up like I expected it to be. The diesel had rinsed the black away so I could see the filter media. So I put it back in and started it.
It sounded good and had plenty of power. I drove about 10 miles and it got 'flat' again. The temp gauge on the dash was normal but the EGT was still 100-200* higher than diesel. I switched back to diesel and it drove normally the rest of the way, with normal power and temperatures.

When I got to within about 5 miles of home and decided to try the oil again. Drove about 3 miles and it really got flat and I had to switch back to diesel.

At this point, I really don't know what to do.

Do you have any thoughts ?

I plan to drive it again tomorrow, primarily bcuz my car is broken down - bad alternator and it's taking me a bit of time to troubleshoot it and take the spare off the parts car and install on my driver.

I'm wondering if my fuel line might be plugging up and not allowing full flow of fuel (new 3/8 hydraulic hose which should not be collapsing or shedding) . I plan to pull it out this weekend and run a wire thru it and pull a rag thru, like cleaning a gun barrel. It's about 15 feet so I do anticipate some trouble doing that. Unfortunately I can't see thru it so I have to "feel" my way thru it.

RoGrrr