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What temperature does diesel fuel gel up?
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johns_79
Posted 1/22/2026 10:01 (#11520412 - in reply to #11520389)
Subject: RE: What temperature does diesel fuel gel up?


Windom, MN
I wish there was a simple answer. But it depends.

Is it pure diesel or bio blend?

If it's B20, you're in trouble. I've had gelling issues in the teens.

If it's B5 or less, you might be okay at zero.

For insurance, I'd put some Howe's or power service in the tractor and have the emergency 911 stuff on hand as well as new fuel filters.

Up here I run a 50/50 mix of #1 and #2 with Howe's diesel treatment in my tractor during the winter. I haven't had an issue yet, but it's also kept in a 50 degree building. Fortunately I don't use a tractor much in the winter so 1 full tractor tank lasts me all winter.

Seems keeping the fuel warm really helps, so since the tractor sits in a heated building you're ahead of the game.

So I'd fill the tractor so the fuel you have is warm. Then I'd consider putting some additive in the tank (not the emergency stuff). Also, if you have an external auxiliary fuel filter on that tractor, wrap something around it to insulate the filter housing.
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