Avoid Using Contaminated Fuel; Bulk Fuel Storage — Diesel Fuel; Diesel Exhaust Fluid- Page 209

2021 Jeep Gladiator Owner's Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
WARNING LIGHTS AND MESSAGES
STARTING AND OPERATING
MULTIMEDIA
SAFETY
OCCUPANT RESTRAINT SYSTEMS
SERVICING AND MAINTENANCE
VEHICLE MAINTENANCE
TECHNICAL SPECIFICATIONS
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STARTING AND OPERATING

207

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 424.

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 427.

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.

The DEF injection system consists of the 

following components:

DEF tank

DEF pump

DEF injector

Electronically-heated DEF Lines

NOx sensors

Temperature sensors

SCR catalyst

The DEF injection system and SCR catalyst enable 

the achievement of diesel emissions 

requirements; while maintaining outstanding fuel 

economy, drivability, torque and power ratings.
For system messages and warnings see  

Ú

page 120.

NOTE:

Your vehicle is equipped with a DEF injection 

system. You may occasionally hear an 

audible clicking noise from under the vehicle 

at a stop. This is normal operation.

The DEF pump will run for a period of time 

after engine shutdown to purge the DEF 

system. This is normal operation and may be 

audible from the rear of the vehicle.

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.

4

21_JT_OM_EN_USC_t.book  Page 207  

Detailed Information for 2021 Jeep Gladiator Owner's Manual

Lists of information found in 2021 Jeep Gladiator Owner's Manual - Page 209

  • 24. 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.
  • 27. 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.

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