Fuel/Diesel Exhaust Fluid (DEF) Gauge
For engines that are EPA10-compliant or newer, the fuel and DEF levels are measured in a dual purpose fuel/DEF gauge. See Fig..
The diesel fuel level is indicated at the top of the gauge, with a low-level warning lamp that illuminates when the diesel fuel level registers 1/8th of capacity. One fuel gauge is standard. If equipped with a second (optional) fuel gauge, each fuel tank level is indicated on a separate gauge.
The DEF level is indicated in the lower portion of the gauge. There is a low DEF level warning lamp that illuminates when the DEF level reaches 10% of capacity. See for details of the DEF gauge functions.
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Diesel Fuel Level Indicator
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DEF Level Indicator
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Low DEF Warning Lamp (amber below 10% DEF)
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Low Fuel Warning Lamp (amber at 1/8 tank of fuel)
Fig. 1, Fuel/DEF Gauge, EPA10
Fig. shows a fuel gauge installed on EPA07 vehicles.
