Use Diesel Treatment in Cold Weather!!
Discussion in 'Experienced Truckers' Advice' started by OldeSkool, Feb 9, 2026.
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40 years in Alaska,only had fuel gelled one time.Probably because #1 is used everywhere in the winter..
Trucks are always plugged in with block heaters all winter,if not left running all the time.
The engine that fuel gelled was an old P&H truck crane,Cummins engine.We had to move it in January,it was usaully in storage all winter.We got it started and it ran a few minutes then stalled out.Put some red 911 in the fuel tank,got it primed then it started again.It ran rough a few minutes but cleared up and ran ok.Feedman, 1999 C12, bryan21384 and 1 other person Thank this. -
So a couple questions I have, does a block heater do any good at all for fuel gelling? I thought it was just to keep the oil warm for cold starts. Also the idea of leaving the truck running I don’t fully understand how it helps because 5 trucks were sitting along interstate today that obviously had been running until the fuel gelled up. I’m new to this north weather so just trying to understand a bit.
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A coolant block heater will keep the engine area pretty warm,fuel not likely to gell in that area,fuel in the tanks will still gell if you have #2 in the tank.
I don't know if the newer engines return warm fuel to the tanks,as much as older engines did,to keep everything flowing.
I don't know why they would gell up running down the road.Maybe they didn't have a water separator on the truck.Feedman, 1999 C12, bryan21384 and 2 others Thank this. -
Don’t some of the truck manufacturers now days offer tank heaters?
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That makes sense. The trucks along the interstate could have been from farther south. It wasn’t predicted to get as cold as it did. Kind of caught us by surprise. I didn’t personally see them either, but a good friend of mine told me about it so I assume it’s true.
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I've never seen a truck that was running gel, with any type of diesel.
My tanks are pretty warm to the touch even when full, at -40* Fahrenheit.
I've also seen plenty of trucks that were treated with more than enough bottled anti gel, gel. I've dealt with it enough to know that at least not all anti gel treatments work. -
Straight Y grade (#1) has a cold filter plug point of -40.Feedman, bryan21384 and IH Truck Guy Thank this.
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If you had a 75/25 and 100% mixture gell it wasn't #1. A lot of places advertise as #1 but if you read closely it says something like blended with additive to #1 equivalent..
I've never had much luck with blended additive fuel. I've triple treated #2 and it will still gel if cold enough..Feedman, Crude Truckin', Accidental Trucker and 4 others Thank this. -
Tell that to my ram that had 100% #1 lol.
Doesnt matter my diesel ram and my landlords trucks were 100% #1. Hell the ram i swap to pure #1 and pop a new filter on in october just to avoid this issue. So it was a fuel issue. As for 75/25 still should not have gelled in -18
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