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2007 GMC Medium Duty
Sorry I don't know how to fill out profile, but we live Regina, Sask, Canada.
We have to use ultra low sufur fuel @ 15ppm, and low ash oil, which we are doing. We run all over North America, fuel filters have been changed at 6 different dealerships in the U.S. and Canada still have the same problem.
It shows no codes, and until a code shows they tell us they cannot fix.
The truck will start off good, then at any time it will go into the low power mode, no codes, nothing.
Fuel pressure was tested, this showed no leaks.
We pull a 51 foot beaver tail and can't even make the hills in Minnesota/ Wisconsin.
With no codes showing up dealership said they can't repair.
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