Shade tree mechanic! Whatcha workin on.

[Hilltop366]

Water in the fuel tank getting stirred up when you gas up or water in the gas station tank?

[TimW]

Ah, for diesels you want BK 245 Fuel system cleaner for Diesels.  $25 on Amazon.

Did you mean BG 245?  https://www.bgprod.com/catalog/diesel-fuel-system/bg-245-premium-diesel-fuel-system-cleaner/

[gspren]

I recommend a can of BG 44K.  The stuff is amazing at dissolving engine deposits.  It will clean your system better than any fuel system cleaner I know of.

Pour in half a can of seafoam, she purrs like a kitten. Top off the gas tank after it's down, random misfire codes.

Grrrrrrrr?!?!

Do you always fuel up at the same place, if so try somewhere else. Maybe try a tank of premium and if that works try some mid grade, sounds like poopy fuel.

[rusticretreater]

Yes BG 245. Typo

[NewYankeeSawmill]

Do you always fuel up at the same place, if so try somewhere else. Maybe try a tank of premium and if that works try some mid grade, sounds like poopy fuel.

It's usually the same brand (local convenience chain), but different stores w/in the brand. I was reading a few things about that, suggested a zero-alcohol high-octane fill-up (as if it's not expensive enough!) I usually get the 97-octane no-alcohol fuel for my small engine machines (including my sawmill), thinking of putting 5-gallons in the tank to see if it helps (sans seafoam).
It ran good yesterday, after re-setting the ECM, but there's some seafoam in the tank, so, not sure it's fixed. I plan to do some running this morning, will add fuel to the tank and see if the misfires come back. Want to check the local shop for that BG42 or some Redline (interesting read on the ingredients here: https://ricksfreeautorepairadvice.com/the-best-fuel-injector-cleaner-and-fuel-system-cleaners/ )

[thecfarm]

I had a Colorado PU I bought used and that had some rough running issues.
It would stall at stop signs sometimes and run rough at times.
I put some super gas in it and it helped out some.
I always got my gas at the same place.
They close the place to count money around 1, when I would go on lunch.
So I got some super from another gas station. That truck ran great!!!
Then I went back to the same place I always get gas.
Started to run rough again.
Then I went back to the other gas station.  Ran great again.
I did this 4-5 times and every time I went to the other gas station to get gas it would run great.
I went to the other place to get my gas.
Just so you know this took a while too, I only drove that truck to work, about 50 miles to work each week.
I always thought all gas was just about the same.

[NewYankeeSawmill]

Thanks @thecfarm . About the only thing I haven't tried yet is dropping the tank, dumping it out, and putting a fresh fuel pump in (only 30 bucks!)