Detroit Diesel Electronic Controls Fig. 14 Page 13 Fig. 13 Series 4000 Low Pressure Fuel Limits 70 60 Fuel pressure drop Max PSI 50 CEL activated 40 Max Fuel Temperature 140F 30 10 20 CEL activates. Oil pressure 0 450 650 850 1050 1250 1450 1650 1850 Engine Speed