Where is DEF stored relative to the DPF?

Where is DEF stored relative to the DPF?

• A. DEF is stored down from the DPF
• B. DEF is stored above the DPF
• C. DEF is stored in the fuel tank
• D. DEF is stored in the oil reservoir

Answer: (A)

The main idea is recognizing how diesel exhaust aftertreatment fluids are kept separate from the exhaust heat and other engine fluids. DEF is stored in its own dedicated tank on the vehicle, and in many layouts this tank sits lower than the DPF (down from the DPF). This arrangement helps keep DEF away from the hot exhaust, makes it easier to route the supply lines up to the dosing unit near the DPF, and allows any spills to drain away from critical components. DEF is not stored in the fuel tank or in the oil reservoir, since those systems handle different fluids.

The main idea is recognizing how diesel exhaust aftertreatment fluids are kept separate from the exhaust heat and other engine fluids. DEF is stored in its own dedicated tank on the vehicle, and in many layouts this tank sits lower than the DPF (down from the DPF). This arrangement helps keep DEF away from the hot exhaust, makes it easier to route the supply lines up to the dosing unit near the DPF, and allows any spills to drain away from critical components. DEF is not stored in the fuel tank or in the oil reservoir, since those systems handle different fluids.