For those who are interested. I was cruising thru Dealer Connect and was curious to know what and how the fuel heater worked

The fuel heater is used to prevent diesel fuel from waxing during cold weather operation.

When the fuel temperature is below 45° ±8 F (7°C), the temperature sensor allows current to flow to the heater element warming the fuel. When the fuel temperature is above 75° ±8 F (24°C), the sensor stops current flow to the heater element.

Battery voltage to operate the fuel heater element is supplied from the ignition switch and through a solid stated device in the IPM. The fuel heater element and "solid state device in IPM" instead of "fuel heater relay" are not computer controlled.

The heater element operates on 12 volts, 300 watts at 0° F (-18° C).

 

I have always wondered how it operated. Now do you know if it changed from year to year or has it been this way for awhile?

Thanks again.

 

I am going to say that 03-07 5.9 are all this way. Not sure of the 6.7 but will look it up on wednesday when i get back to work.

 

cool... thanks

 

I never realized they had them. Looked in the parts manuals for an 07 and an 05. They're different parts, but nonetheless, mine has one too.

According to my '05 FSM, the circuit close temperature is 34ºF, and the circuit open temperature is 64ºF (converted from Celsius).

 

You guys with these parts manuals....

#1.... where can I get one and how much?

#2.... if they are too much, can someone look up the thread of the pitman arm nut (nut that holds the pitman arm to the steering gear)?

 

i work for a dodge dealer so I was cruising around the dealer connect lookin for info to post for the new guys. You need a pitman arm nut?

 

No... I wanted to machine a piece similar to what's used in the DSS steering brace setup.

 

Wasn't aware that it ran so much, I'm going to feel my fuel filter housing in the morning...

 

Is this heating the fuel even when the truck is not running or off ??

 

No... that would quickly run your batteries down.

 

So, if the truck is setting and not being ran, the fuel could gel. Like over night. Is this correct?
What is the purpose of the fuel heater? wouldn't there be enough heat from the engine to prevent gelling?

 

Its also caused me ALOT of problems with my truck.

After about 12 rentals, the dealer finally updating my comp. Everytime it dropped below -10 the engine light would come on upon starting.

Last week I forgot to plug in my truck and just cycling that fuel heater twice, drained my batteries enough that it wouldnt start.

Shep1, when its -30 outside, your engine doesnt stay warm for very long lol. Hence the fuel heater...

 

at -30 NOTHING wants to work! LOL... Keep her plugged in til you got it started, then unplug her.

 

Ok so what happens when you have a FASS system and the factory filter is bypassed, could this cause a fire? Or maybe just melt some of the factory filter assembly.

When I have my engine rebuilt, it was recomended to reconnect my factory filter and run it in series with the FASS setup. Well after a 1.5 years on the FASS, I could not get any fuel to flow through the factory filter assembly to my CP3. I don't know where my problem is in the filter assembly or in the line from the filter to the CP3.

I'm fairly sure the problem is in the filter assembly because I have fuel leaking from Rail out the relief and comes slowly out my line.

Any comments?