2001 F250 7.3l lost my fuel economy

[Jsblackthunder]

About a year and half ago I was on my way to a hunting trip, when my truck shut down. It would crank but not start. So know the cam/crankshaft sensors have problems I replaced them. No go. Found that my PCM fuse blow because my fuel in water probe had shorted out. I replaced the water probe and pcm fuse. Truck runs like normal, or so I though. I have had a Hyper-tech programmer since 2005. I have a new air filter, fuel filter, I use Amsoil motor oil and Diesel Booster. I don't seem to have any leaks of fuel or vacuum leaks, no know engine codes. looking for possibilities.

[jesilvas]

welcome1:
Lots of things to check.
So what was your mileage before and after? And how are you calculating your mileage?

[Jsblackthunder]

Well I would typically get 15/16 mpg in the city. now its closer to 12/13. I usually reset my trip every time i fill up. so instead of getting 420/440 per 25 gallons i get close to 300. I work at an auto repair facility but i don't have a diesel mechanic. So instead of just guessing i'm looking for some wise council

[jesilvas]

Ok, well as long as your hand calculating then at least you know you're right.
Vacuum leaks are not an issue, different type of motor.
Dang, it's hard to tell.
Brake calipers are bad on these, MAP sensor maybe, EBP tube and sensor, ICP sensor maybe. Just shots in the dark.

[Jsblackthunder]

I have noticed some pulsation when braking at slow speeds and I haven't taken the wheels off to check. Thanks for some pointers. I'll check into them this tomorrow and get back with you.

[jesilvas]

That might be warped brake rotors.
Did it happen IMMEDIATELY after the PCM lost power?