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Murf - 7 3L Diesel Question for ya
The first few 'minor' mod's I did to mine actually improved my mileage.
When it got above about 350hp it went back down again.
But it's waaaaay more fun this way. hehehehe.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Ok, here's what I found so far. The fuel filter was, um, very dark. A deep, dark brown color. So I'm thinking that certainly wasn't helping matters. So it's been changed out. I drained the water collector and didn't find much water. I also added that fuel stuff to work on cleaning the injectors.
The flex joints for the intake from the turbo are very dirty like there's been some blow-by. Is this a potential problem? Normal?
Now, the latest fun is the rear end. I noticed a small fresh puddle of oil on the garage floor under the rear end pumpkin. Closer examination shows the whole underside of the rear end housing coated in oil. The drive shaft is clean. Anyone ever blow a seal before?
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Murf - 7 3L Diesel Question for ya
Murf, out of curiosity, what were the first couple of changes that helped improve your mileage?
I've got this thing for at least another 100k miles since we had to trade in the wife's Mustang GT convertible for an SUV due to our first baby being on order (currently 19 weeks into the usual 40+ weeks of back-order). So my vehicle needs are being ignored. So I'm interested in some additional mileage. If power was boosted as well... Well, that would be a shame and I would just have to sacrifice and accept that result. 
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Murf - 7 3L Diesel Question for ya
The very first things done were;
a) get rid of the factory plumbing and install a 4" mandrel-bent system from end to end with a zero restriction muffler, and,
b) install a K & N air filter cartridge in the factory box.
These two little things alone made probably, as a seat of the pants estimate, a 50 hp boost and made the truck really wake up, the factory setup is too restrictive, both on air coming in and leaving.
Your fuel filter was certainly past it's prime, the dark colour is a combination of debris and algae, neither of which are good.
The dirt on the intake tube is indicative of two things, too much vacuum there, causing debris to either by-pass or go right through the factory air filter, and oil vapour being drawn up through the PCV system, again caused by too much vacuum. A high-quality permanent air filter element should solve that problem.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Murf: How often (on average) do you service your K&N? Just wondering, I haveone of those too. Do you ever have problems of dust getting past it? I have found pollen/dust past mine on occasion.
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Murf - 7 3L Diesel Question for ya
I put a K & N on an old sports car and was startled by the amount of stuff that made it past the filter element. It seems the price you pay for better flow is reduction in filtering ability. I yanked it after a month.
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Murf - 7 3L Diesel Question for ya
In my own truck it gets washed out and re-oiled every other oil change, which is 10,000 kilometers, about 6,000 miles. In the fleet it gets done every 12,000 miles, but they do more miles in a shorter time and mostly highway at that.
If it is not kept very clean, yes, you will get either debris past or oil vapour up from the sump through the PCV.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Ken, are you sure the filter had been properly oiled ?
The filter media in a K & N has much smaller openings than the factory paper one does. It would actually catch far more, not less.
Best of luck.
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Murf - 7 3L Diesel Question for ya
Yep, I oiled it up per the instructions. After a week I cleaned it and oiled it a second time but it didn't help any. I figured they were popular among the hot rod crowd for performance reasons, but racers seem to care more about performance than longevity.
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Murf - 7 3L Diesel Question for ya
Thanks for your help Murf. It was definitely peppier this morning with the new fuel filter. It was clearly a problem. I took it easy due to the blown rear end seal. I can't get it in for repair until Saturday. I don't have time to do it myself.
I'll have to look into an exhaust system. I can understand why I may have too much vacuum. I like it when some punk kid sees my truck ad decides they want to pass cause the truck will obviously be too slow. They don't like getting beat by such a big vehicle!! I know my brother was pissed when I beat his car in a race and I was slow due to spinning the tires on the wet pavement.
There is no replacement for cubic inches!
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