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Fully loaded with horses I'd say somewhere around 12000 lbs but i can get it to throw the power light even with the trailer unloaded on not much of an incline. I am just very skeptical of the dealership wanting to change the fuel cooling radiator because in my way of thinking since it is not leaking fuel that if this were the problem it would surely present itself during normal driving conditions in stop and go traffic as the weather is hovering around 100 degrees here. In your last reply i think you meant to say that you are doubtful of the pump is that right?
Thank you very much for the insight.
I have only ever changed one cooler, and it was because it was leaking.
Yes, I do not suspect the pump.