Jeep Gladiator 2021, Owner'S Manual, Page: 200 / 484

198 STARTING AND OPERATING
Fuel and Diesel Exhaust Fluid (DEF) Fill Location
NOTE:

When the fuel nozzle “clicks” or shuts off, the
fuel tank is full.

Tighten the fuel filler cap about a quarter turn
until you hear one click. This is an indication
that the cap is properly tightened.

If the fuel filler cap is not tightened properly,
the MIL will come on. Be sure the cap is tight -
ened every time the vehicle is refueled.
A
VOID
U
SING
C
ONTAMINATED
F
UEL
Fuel that is contaminated by water or dirt can
cause severe damage to the engine fuel
system. Proper maintenance of the engine fuel
filter and fuel tank is essential see
Ú
page 398.
B
ULK
F
UEL
S
TORAGE
— D
IESEL
F
UEL
If you store quantities of fuel, good
maintenance of the stored fuel is also essential.
Fuel contaminated with water will promote the
growth of “microbes.” These microbes form
“slime” that will clog the fuel filtration system
and lines. Drain condensation from the supply
tank and change the line filter on a regular
basis.
NOTE:
When a diesel engine is allowed to run out of
fuel, air is pulled into the fuel system.
If the vehicle will not start see
Ú
page 401.
D
IESEL
E
XHAUST
F
LUID
Your vehicle is equipped with a Selective
Catalytic Reduction (SCR) system to meet the
very stringent diesel emissions standards
required by the Environmental Protection
Agency.
The purpose of the SCR system is to reduce
levels of NOx (oxides of nitrogen emitted from
engines) that are harmful to our health and the
environment to a near-zero level. A small
quantity of Diesel Exhaust Fluid (DEF) is
injected into the exhaust upstream of a catalyst
where, when vaporized, it converts
smog-forming nitrogen oxides (NOx) into
harmless nitrogen (N2) and water vapor (H2O),
two natural components of the air we breathe.
You can operate with the comfort that your
vehicle is contributing to a cleaner, healthier
world environment for this and generations to
come.
System Overview
This vehicle is equipped with a Diesel Exhaust
Fluid (DEF) injection system and a Selective
Catalytic Reduction (SCR) catalyst to meet the
emission requirements.
1 — Diesel Fuel Filler
2 — DEF Filler
WARNING!
Do not open the high pressure fuel system
with the engine running. Engine operation
causes high fuel pressure. High pressure fuel
spray can cause serious injury or death.