How do I prevent my diesel fuel lines from freezing in extreme cold weather?

In cold states, truck stops often sell #1 diesel or winter-blended fuel, which resists gelling much better than summer diesel. Anti-gel additives should always be added BEFORE the fuel gets cold, and most mechanics recommend using it at every fill-up once temperatures drop below about 15°F, following the bottle ratios carefully. Keeping your tanks as full as possible helps reduce condensation and water buildup, which can lead to icing in fuel filters. It’s also smart to replace fuel filters before winter begins, because old filters plug quickly once wax crystals start forming. Plugging in your block heater and using factory fuel heaters overnight helps keep fuel warm, improves cold starts, and reduces strain on the starter and batteries. If the truck is already gelled up, do not keep cranking nonstop — the best steps are to move the truck into a warm shop if possible, replace clogged fuel filters, use an emergency de-gel product like Power Service 911, and allow the engine and fuel system to warm up fully before restarting. Warning signs of gelling include loss of power, engine surging, fuel pressure codes, starting then dying, and waxy fuel inside the filter housing.

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