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Automotive glossary

Diesel Fuel Heater

A diesel fuel heater warms the fuel, often at the filter, so wax crystals do not block it in cold weather.

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What is Diesel Fuel Heater?

It may be electric or use warm returning fuel or coolant. It is often built into the fuel filter housing. It works mainly in cold conditions. Some heaters only switch on below a set temperature.

How it works

Heating the fuel above its cloud point keeps wax dissolved.

Why it matters for your car

A failed heater can cause winter starting problems. Use winter diesel in cold climates.

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