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Hesitation fuel heater problem

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I've been having problems with my truck hesitating after about 10 minutes. Felt like a fuel supply issue. After seeing my fuel heater actually smoking I pulled the relay and have not had any problems with hesitation, and actually it seems as though I have a bit more power. I've read a lot on several forums about symptoms similar to mine, but no one has mentioned the fuel heater circuit as a potential cause. I just wanted to let the forum know that I had this issue that seems to be cured by disabling the fuel heater. No idea why this would cause a hesitation problem, except if the fuel got so hot that the VP would shut down, but I've never seen codes to indicate this.

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