FASS Fuel System Notes / Gelling Issues?

**Scully Motorsport** · 2 Weeks Ago

Hey guys, I installed a FASS fuel system with a sump in my 2013 2500 last winter (November 2024).

It was a complete system with the filter heater and sump.

Just a cool side note for people searching: I installed the sump directly under the stock pickup and left the stock pickup and fuel lines in the truck because they were working fine.

I covered the feed line in the engine bay when I removed it.

If I have issues with the stock system, I can thread it back in, reach under the truck, and plug in the pigtail for the stock one, and it should work like stock if I were ever in a bind.

This may be what I planned for.

Here in Chicago, we have been hovering around zero degrees.

I try not to drive my truck when there is salt on the ground, but a few weeks ago and today I needed it.

Around zero degrees, it starts up and runs fine, and then dies after a few minutes and continues to die more and more often.

I limped it to work and got it into a heated shop, and it was fine for the rest of the day.

I added a whole bottle of Power Service and let it circulate very well.

I went to start it today, and it did it again.

Has anyone else had issues with FASS hanging filters and gelling?

I literally just changed the filters a few months ago; they have maybe 400 miles on them.

Just mainly curious if anyone else has had this issue or if I need to consider bad fuel or another problem.

I fill up at the brand-new Shell station by my house, and my front filter is always clean and white when I change it.

Thanks,
Joe

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**RogueDiesel** · 2 Weeks Ago

I was planning to buy the FASS system, but my local shop talked me out of it.

I also live in a cold area, north of the Twin Cities (Minnesota).

The reason they gave me was that the filters are more exposed to the wind/cold than where the stock filter housing is in the rear.

Even though I use Hot Shots anti-gel, they still talked me out of it.

Since talking me out of it, they lost $ $ $ $.

So I do believe there is value in what they said, and it makes sense since the FASS filters are more open to the wind and cold.

I used the Power Services last year since my work uses it, but some semis still have it, and I got it twice.

This year, I have been using Hot Shots anti-gel, and I have never gelled this winter, and my truck is my daily driver.

Sent from my iPhone using Tapatalk

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**AK Bob** · 2 Weeks Ago

For what it’s worth, I installed an extra fuel filter from “Diesel Fuel Filter Kits” in 2020.

This kit locates the additional fuel filter next to the rear OEM frame-mounted filter and includes a cold-weather sleeve (foam pipe insulation).

See the photo below.

I live in Alaska and have never experienced any gelling.

I do add Archoil AR6300 winter treatment to every tank during the winter months, October-April.

IMG_0867.jpg

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**Scully Motorsport** · 1 Week Ago

A few noteworthy things I will add.

1. I called FASS, and yes, they said people do run filter socks, and that seems to help.

2. I recently installed the BBI stage .75 injector,s and that is when I replaced all the fuel filters.

When I was priming the fuel system over and over and cranking it, there was smoke coming off the front fuel filter housing.

I assumed it was from the heater, and now that I think about it, I should really make sure that it didn't kill itself if it got hot and then hit with cold fuel.

3. I let it warm up on a 20-degree day recently with the same fuel, and I thought it was fine because it idled for 15 minutes without issue.

When I started driving, it would fall on its face every once in a while, but not die.

So even in warmer weather, that should not be an issue; it still was.

FASS says fuel waxing with Biodiesel can start happening at 35 degrees.

I am going to run out of this fuel while it's warm right now, fill it up somewhere else, and see how it is.

I will report back if that does not fix it.

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