Fuel/Diesel Exhaust Fluid (DEF) Gauge, EPA10 and Newer

For engines that are EPA10-compliant or newer, the fuel and DEF levels are measured in a dual purpose fuel/DEF level gauge. See Fig..

Diesel Fuel Level Indicator

DEF Level Indicator

Low DEF Warning Lamp (amber below 10% DEF)

Low Fuel Warning Lamp (amber at 1/8 tank of fuel)

Fig. 1, Fuel/DEF Gauge, EPA10 and Newer

The diesel fuel level is indicated at the top of the gauge, with a low-fuel warning lamp that illuminates amber when the diesel fuel level registers 1/8th of capacity.

The DEF level is indicated in the lightbar on the lower portion of the gauge. There is a low DEF level warning lamp that illuminates amber when the DEF level reaches 10% of capacity. See General Information for details of the DEF gauge functions.