fuel heater
Thread Starter
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New User
Joined: Feb 2008
Posts: 8
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From: illinois
fuel heater
can anyone tell me how the fuel heater works ! does it have a temp sensor in the fuel line some where or is it therostate controled;; mine stays on all the time. i unplug it for now.
Elder User
Joined: Feb 2008
Posts: 544
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From: El Paso, Texas
I don't know how the fuel heater works or what temp, but I will tell you that I live in Alaska right now and I have seen the temp go to -35 below zero and my 7.3L didn't have a problem at all. The fuel didn't gel up at all. Maybe they put a special additive up here. I don't know. I am in the military, and all of our army trucks don't have a problem either, but they run on JP8 which is a highly refined diesel fuel. I really wouldn't worry about the fuel heater, but there are a lot more people on here that know a lot more than I do. Maybe they will have you an answer.
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New User
Joined: Feb 2008
Posts: 8
Likes: 0
From: illinois
fuel heater
after replaceing my injectors i found on # 8 ;the bottom o-ring was burnt on 2 sides;my brass / copper sealing ring was sealing ok so it wasnt compresson that had burnt it . so i checked the heater & it has battery power on it all the time. so i wasnt sure if it had a sensor on it that shut it off or maybe it had a therostat inside the filter housing that shut it off. after the truck got warm it seem to run a little ruff. i took compresson & it was ok . the day i check the heater it was around 48 deg. thanks for the come back & help
Senior User
Joined: Dec 2007
Posts: 449
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put a 30 amp relay on the line and run it off a switch so you can turn it off when the weather warms up i ran heaters on my big truckes for many years. J-8 is not hightly refined diesel fuel. it is a different distalate and it dosent jell until about 150 below zero. the add about 25% kerosene in ak in the winter. that is what "winter" blend is.
