Fuel/water separator filter turning black

[Signature620]

(09-05-2020 )Chamberpains Wrote:  What do these filter restriction gauges look like and where are they located? I kind of like the idea of having a quick check indicator on the fuel lines.

When they come with a restriction gauge from the factory, KW usually T into the Davco outlet fitting and run -4 size hose to the cab.

[Mattman]

Mine is a gauge in the dash from the factory, it is electronic. Sending unit for gauge is mounted on my paccar fuel filter housing.

[amermextrucker]

Mines turns the filter black as well. Glad to hear its normal.

[Explosia]

I’m glad as well to hear that it is normal. Thanks for everyone’s input. I have the oem fuel filter gauge as well, I thought that was for the fuel filter not the water separator?

[snailexpress]

My filter doesn't go black. Darker but not black. Every couple months I fill full tanks with shock dose Biocide before parking for my days off to let it work.
Also fuel supplier can have bad fuel. Once got something like green slime covered filter after fueling.

[Waterloo]

Mine stays clean, but I am picky about where I purchase fuel. Only straight diesel, no bio or whatever else outfits like Flying J and Pilot pollute their fuel with. I primarily purchase from TA and Petro.

[Explosia]

TA is the only fuel through these filters.

[Waterloo]

(09-06-2020 )Explosia Wrote:  TA is the only fuel through these filters.

I'll have to eyeball mine, I just changed it out not long ago, 10 micron Fleetguard.

[Ben50291]

I used to haul fuel, bio is not always a choice of fueling station but rather the State mandate for where it's located. For example Minnesota from April to October I believe,is 20 percent bio, mandated and October to April 10 percent