Brother just bought a 2010 6.4 and we put on the spartan DPF delete kit. Truck runs great but after a 100 mile trip we changed screens on the gauge and noticed the fuel temp was 148 degrees. Truck was wrecked and rebuilt in the front just before he bought it with new coolers in the front. Just wondering if there could be air in the fuel cooler. The coolant level for the fuel cooler is full.