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Fuel coolers are heat exchangers fitted to diesel vehicles to reduce fuel temperature before it returns to the tank. Hot fuel reduces the volumetric efficiency of the injection system and, in extreme cases, can cause vapour lock. Fuel coolers are common on high-performance diesel engines and commercial vehicles where fuel recirculation volumes and under-bonnet temperatures are high.
Modern common-rail diesel injection systems recirculate a significant volume of fuel through the high-pressure pump and injectors. This fuel absorbs heat and returns to the tank at elevated temperatures.
Fuel coolers can fail from internal or external corrosion, vibration-induced cracking, or fuel contamination. Symptoms are often subtle.

Commonly searched OE numbers fitting Fuel Cooler from the TecDoc catalogue.