Actron CP7838 - User Manual

Safety Precautions
To prevent accidents that could result in
serious injury and/or damage to vehicle or test
equipment, carefully follow safety rules and test
procedures at all times when working on vehicles.
 Always wear approved eye protection.
 Never use Fuel Pressure Tester Kit on Diesel or
Flex Fuel engines!
 Never attach or remove Fuel Pressure Tester Kit
from fuel rail test port with ignition key on.
 Always place end of 6 foot bleed-off hose in an
approved container for fuel during testing and
when bleeding off fuel pressure.
 Never smoke or have open flames near vehicle.
Vapors from fuel and charging battery are highly
flammable and explosive.
 Never permit fuel to spill on hot engine parts. If a
spill or leak occurs, immediately turn ignition
key off, and clean up fuel.
 Only use Fuel Pressure Tester Kit for measuring
fuel pressure.
 Always operate vehicle in a well ventilated area.
English
CP7838
Instructions for Professional
Fuel Pressure Tester Kit
The Fuel Pressure Tester Kit was designed to help diagnose driveability
problems due to abnormally high or low fuel pressure
Do not inhale exhaust gases or fuel vapors.
 Always keep yourself, tools and test equipment
away from all moving or hot engine parts.
 Always make sure vehicle is in PARK
(Automatic transmission) or NEUTRAL (manual
transmission) and parking brake is set. Block
drive wheels.
 Never lay tools on vehicle battery. Terminals may
short together causing harm to yourself, tools or
battery.
 Never leave vehicle unattended while running
tests.
 Always keep a fire extinguisher suitable for fuel/
electrical/chemical fires handy.
 Always use extreme caution when working
around ignition coil, distributor cap, ignition
wires, and spark plugs. These components
contain High Voltage when engine is running.
 Complete all Pre-Testing Checks before
beginning fuel pressure testing.
 Always follow vehicle manufacturers warnings,
cautions and service procedures.
Fuel Pressure Tester Description
1 Rubber Boot: Boot is used to protect gauge and maintain
appearance.
2 Dial Face: Contains measurement scales that show amount
of fuel pressure present in fuel system.
3 Pressure Relief Button: Used to relieve fuel pressure in
gauge hose before disconnecting gauge hose from fuel rail.
4 Bleed-Off Hose: A 6 foot hose that bleeds off fuel pressure
when pressure relief button is pressed. Never use a bleed-off
hose shorter than 6 foot.
Important: Always make sure end of bleed-off hose is in an
approved container for fuel at all times during testing and when
bleeding off fuel pressure!!
5 Gauge Hose: Hose that carries fuel to the gauge, so that
pressure can be measured.
6 GM/Chrysler Test Port Adapter: Adapter is used to connect
gauge hose to GM, Chrysler, and other vehicles equipped with a
schrader valve test port on fuel rail.
7 Ford Test Port Adapter: Adapter is used to connect gauge
hose to Ford vehicles equipped with a schrader valve test port on fuel rail.
8 GM TBI Test Adapter: Adapter is used to connect gauge hose to GM TBI vehicles NOT equipped
with a schrader valve test port.
9 M12 X 1.25 Banjo Bolt Adapter: Adapter is used to connect gauge hose to Asian, European and
select domestic vehicles equipped with fuel Banjo Bolt Connections.
10 Dual Manifold Test Adapter: Adapter is used to connect gauge hose to vehicles with rubber hose
connections on the fuel rail, fuel line, or fuel filter.
20
40
60
80
10 0
10 0
200
300
500
400
600
700
kPa
psi
10
30
50
70
90
2
3
4
5
6
7
8
9
10
1
®

Summary

Safety Precautions

Fuel Pressure Tester Description

Fuel System Theory and Components

Pre-Testing Checks

Fuel Pressure Testing Procedures

GM;Chrysler Vehicle Connection

Instructions for connecting the tester to GM/Chrysler fuel rail test ports.

Ford;Lincoln;Mercury Vehicle Connection

Instructions for connecting the tester to Ford/Lincoln/Mercury fuel rail test ports.

GM TBI Vehicle Connection

Instructions for connecting the tester to GM TBI vehicles without test ports.

Banjo Bolt Connection

Instructions for connecting the tester to vehicles with banjo bolt fuel lines.

Rubber Hose Connection

Instructions for connecting the tester to vehicles with rubber fuel hoses.

GM;Chrysler Disconnection

Steps to safely disconnect the tester from GM/Chrysler vehicles.

Ford;Lincoln;Mercury Disconnection

Steps to safely disconnect the tester from Ford/Lincoln/Mercury vehicles.

GM TBI Disconnection

Steps to safely disconnect the tester from GM TBI vehicles.

Banjo Bolt Disconnection

Steps to safely disconnect the tester from banjo bolt connections.

Rubber Hose Disconnection

Steps to safely disconnect the tester from rubber hose connections.

General Fuel Pressure Diagnostics

Actron CP7838 Specifications

General

Resistance Measurement	Yes
Continuity Test	Yes
Diode Test	Yes
Data Hold	Yes
Data Logging	No
Backlight	Yes
Battery	9V
OBD II Compatibility	No
Updateable	No
Type	Multimeter
Display	LCD
Functions	Voltage, current, resistance, continuity, diode test