Fuel filter wiring - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 04-15-2019, 09:18 AM Thread Starter
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Fuel filter wiring

Anybody know what the red and black wires plugging into the back of the filter housing are going to? The filter along the engine


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post #2 of 9 (permalink) Old 04-15-2019, 09:41 AM
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There are two fuel filter housings, one alongside the engine and one at the rear of the truck near the fuel tank. Both housings contain the following, as of 2013:

-Fuel Filter
-Fuel / Water Separator
-Water-in-Fuel (WIF) Sensor
-Fuel Heater

So, the wires you are seeing could be the WIF sensor or the fuel heater.

By the way, in regards to your other post, the fuel heaters automatically turn on when fuel temps are below 32F and turn off when fuel temps reach 64F.

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post #3 of 9 (permalink) Old 04-15-2019, 09:55 AM
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Quote:
Originally Posted by andrew1346 View Post
Anybody know what the red and black wires plugging into the back of the filter housing are going to? The filter along the engine
The housing in the engine bay contains a fuel heater only, so that’s what the red and black wires are for. The rear chassis filter has the WIF sensor and a heater.
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post #4 of 9 (permalink) Old 04-15-2019, 09:56 AM
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Maybe the FCA documentation is wrong?
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post #5 of 9 (permalink) Old 04-15-2019, 10:02 AM
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Quote:
Originally Posted by troverman View Post
Maybe the FCA documentation is wrong?
Not sure if that was only 2013. Here’s the schematic for 2015, and remains the same-
Yellow arrow is the engine mounted, red arrow is the chassis mounted.
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post #6 of 9 (permalink) Old 04-15-2019, 10:06 AM
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Could be, but that is still the current documentation. I do see from your wiring diagram there appears to be no wiring to a front water sensor, although they still label the rear sensor as "WIF 2."

Not sure on GM trucks, but Fords only have a WIF on the frame-mounted filter.

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post #7 of 9 (permalink) Old 04-15-2019, 10:10 AM
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Quote:
Originally Posted by troverman View Post
Could be, but that is still the current documentation. I do see from your wiring diagram there appears to be no wiring to a front water sensor, although they still label the rear sensor as "WIF 2."

Not sure on GM trucks, but Fords only have a WIF on the frame-mounted filter.
Man, what a dummy! I opened up the file and it was zoomed in. If I would have just zoomed out a little...
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post #8 of 9 (permalink) Old 04-15-2019, 10:16 AM
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So apparently it does have 2 sensors after all!

Those sensors might become a lot more important on new trucks with the CP4...
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post #9 of 9 (permalink) Old 04-15-2019, 11:10 AM
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Glad to have such information....
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