Actron CP7818 User Manual
®
CP7818 – Fuel Pressure Tester Kit
INSTRUCTIONS
•
Fuel pressure testing involves some contact with pressurized fuel.
•
Do not use the Fuel Pressure Tester Kit on Diesel or Flex Fuel engines.
•
Only use the Fuel Pressure Tester Kit on Gasoline powered engines.
•
Helps diagnose driveability problems due to abnormally high or low fuel pressure.
VEHICLE APPLICATION LIST
The Fuel Pressure Tester Kit works on most domestic fuel injected vehicles
having a schrader valve test port on the fuel rail. This includes Ford
high pressure central fuel injection and GM, Ford, and Chrysler multiport fuel injection. Multi-port means one fuel injector per cylinder.
Domestic FORD,
LINCOLN, MERCURY
High Pressure Central Fuel Injected
1981-86 Country Squire, Crown
1985-86 Mustang & Capri
1985-87 Thunderbird & Cougar
1981-85 Continental, Town Car, Mark VI
1980 Versailles
Most Multi-Port Fuel Injected Vehicles
Not Including:
1.3L Festiva & Aspire
1.6L Capri
1.8L Escort & Tracer
2.0L, 2.2L & 2.5L Probe
3.0L Villager
(CFI) Vehicles
Victoria, LTD, Colony Park,
Grand Marquis, & Marquis
& Mark VII
1983 to 1996.
Year Engine 8th VIN Digit
1995-96 2.0L C or Y
1984-93 2.2L Turbo E
1995-96 2.4L X
1984-92 2.5L Turbo J
1987-96 3.3L R
1993-96 3.5L F
1987-93 3.8L L
Multi-Port Fuel Injected Trucks & Vans
Year Engine 8th VIN Digit
1996 2.4L B
1989 2.5L Turbo J
1992-96 3.3L R
1994-96 3.8L L
1992-96* 3.9L X
1992-96* 5.2L Y
1993-96 5.9L 5 or Z
1994-96 8.0L W
Domestic GENERAL MOTORS
Most Multi-Port Fuel Injected Vehicles
1984 to 1996.
Not Including:
1988 1.6L Nova
1988-89 1.5L Spectrum
1987-90 Sprint Turbo
* Some 1996 engines may not have a schrader valve fuel rail test port.
Year Engine 8th VIN Digit
1991-95 2.5L P
1987-96* 4.0L S
1993-96* 5.2L Y
Year Engine 8th VIN Digit
1995-96 2.0L Y
1993-96 3.3L T
1993-96 3.5L F
Domestic CHRYSLER,
PLYMOUTH, DODGE
Multi-Port Fuel Injected
Passenger Vehicles
JEEP
Multi-Port Fuel Injected Vehicles
Domestic EAGLE
Multi-Port Fuel Injected Vehicles
Vehicle Service Information:
The following is a list of publishers who have manuals containing electronic fuel injection system
information. Some manuals may be available at auto parts stores, your local dealer, or your local
public library. For others, you need to write for availability and prices, specifying the make,
model and year of your vehicle.
Aftermarket Vehicle Service Manuals:
Chilton Book Company
Chilton Way
Radnor, PA 19089
Haynes Publications
861 Lawrence Drive
Newbury Park, CA 91320
Cordura Publications
Mitchell Manuals, Inc.
Post Office Box 26260
San Diego, CA 92126
Motor’s Auto Repair Manual
Hearst Company
250 W. 55th Street
Vehicle Service Manuals from
General Motors Corporation:
Buick
Tuar Company
Post Office Box 354
Flint, MI 48501
Oldsmobile
Lansing Lithographers
Post Office Box 23188
Lansing, MI 48909
Cadillac, Chevrolet, Pontiac
Helm Incorporated
Post Office Box 07130
Detroit, MI 48207
New York, NY 10019
Vehicle Service Manuals from
Vehicle Service Manuals from
Ford Motor Company:
Ford Publication Department
Helm Incorporated
Post Office Box 07150
Detroit, MI 48207
Customer Service
For product information or customer service
please call 1-800-ACTRON-7 (1-800-228-7667)
Monday through Friday, between 8:30 a.m. and
4:30 p.m. Eastern time or fax anytime at
(216) 651-2388.
Actron can also be reached by Email or on the
Internet.
Email address: sunpro@actron.com
Chrysler Corporation:
Chrysler Corporation
Dyment Distribution Service
Service Publication
12200 Alameda Drive
Strongsville, Ohio 44136
One Year Warranty
If within one year from the date of
purchase this equipment fails due
to defect in materials or workmanship, return it to Actron and Actron
will repair it free of charge.
This warranty gives you specific
legalights, and you may also have
other rights which may vary from
state to state.
Internet home page: http://www.actron.com
Note
All information, illustrations and specifications contained in this manual are based on the latest
information available from industry sources at the time of publication. No warranty (expressed
or implied) can be made for its accuracy or completeness, nor is any responsibility assumed
by Actron Manufacturing Co. or anyone connected with it for loss or damages suffered through
reliance on any information contained in this manual or misuse of accompanying product.
Actron Manufacturing Co. reserves the right to make changes at any time to this manual or
accompanying product without obligation to notify any person or organization of such changes.
Instructions for Fuel
Pressure T ester Kit
Safety Precautions
To prevent accidents that could result in
serious injury and/or damage to your vehicle
or test equipment, carefully follow these
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 Fuel Pressure Tester to any
place other than the fuel rail test port. Do
not confuse Air Conditioning schrader
valves with the fuel rail test port.
• Never attach or remove Fuel Pressure
Tester Kit from fuel rail test port with the
ignition key on.
• Always place end of 6 ft. 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 the Fuel Pressure Tester Kit for
measuring fuel pressure on vehicles having
schrader valves as their fuel rail test port. Do
not use this kit for any other purpose!
• Always operate the vehicle in a well ventilated area. Do not inhale exhaust gases or
fuel vapors - they are very hazardous!
• Always keep yourself, tools and test equipment away from all moving or hot engine
parts.
• Always make sure the vehicle is in PARK
(Automatic transmission) or NEUTRAL
(manual transmission) and that the park-
ing brake is firmly set. Block the drive
wheels.
• Never lay tools on vehicle battery. You
may short the terminals together causing
harm to yourself, the tools or the 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 the ignition coil, distributor cap, ignition wires, and spark plugs. These compo-
nents contain High Voltage when the engine is running.
• Complete all Pre-Testing Checks before
beginning fuel pressure testing.
• Always follow vehicle manufacturer’s warnings, cautions and service procedures.
CAUTION:
Some vehicles are equipped with safety
air bags. You
must
follow vehicle service
manual cautions when working around
the air bag components or wiring. If the
cautions are not followed, the air bag
may open up unexpectedly, resulting in
personal injury. Note that the air bag can
still open up several minutes after the
ignition key is off (or even if the vehicle
battery is disconnected) because of a
special energy reserve module.
Fuel Pressure Tester
Description
1. Dial Face: Measurement scale that
shows amount of fuel pressure present
in fuel system.
2. Pressure Relief Button: Used to re-
lieve fuel pressure in the gauge hose
before disconnecting the gauge hose
from the fuel rail.
3. Bleed-Off Hose: A 6-ft. hose that bleeds
off fuel pressure when the pressure relief
40
60
300
400
200
500
20
100
psi
80
600
700
kPa
100
3
4
Fig. 1
1
2
6
5
button is pressed. Never use a bleed-off
hose shorter than 6 ft.
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!!
4. Gauge Hose: Hose that carries fuel to
the gauge so that pressure can be measured.
5. GM/Chrysler Test Port Adapter: This
adapter is used to connect the gauge
hose to GM and Chrysler vehicles
equipped with a schrader valve test
port on the fuel rail.
6. Ford Test Port Adapter: This adapter
is used to connect the gauge hose to
Ford vehicles equipped with a
schrader valve test port on the fuel
rail.
Fuel Injection System Theory
There are two basic types of fuel injection
systems currently being used by GM, Ford,
and Chrysler. The first type is called “port”
or “multi-port” fuel injection. In this system,
the fuel injectors spray fuel directly into the
intake manifold behind the intake
valve. These systems typically have
one fuel injector per
Fig. 3
FUEL
INJECTORS
FUEL RAIL
TEST PORT
cylinder. The second type is commonly called Throttle
Body Injection (TBI)
for GM and Chrysler
vehicles or Central
Fuel Injection (CFI)
for Ford vehicles.
These systems use
VACUUM
PORT
one or two fuel injectors mounted on top
of the intake manifold. They spray fuel
into the throttle body
similarly to a conventional carburetor.
See Fig. 2 for illustrations of both types
of fuel systems.
Fuel System Components
Before doing any fuel pressure testing, it is a
good idea to understand how fuel system
components work and how they relate to one
another. The fuel pump pumps fuel from the
fuel tank to the fuel pressure regulator and
fuel injectors. The fuel pressure regulator
Fig. 2
FUEL
INJECTORS
FUEL PRESSURE
REGULATOR
Ford CFI
Throttle Body
FUEL
INJECTORS
PRESSURE
LINE
FUEL RAIL
TEST PORT
RETURN LINE
FUEL PRESSURE
REGULATOR
GM Multi-Port
Fuel Injection
FUEL PRESSURE
REGULATOR
FUEL INJECTORS
FUEL
TANK
FUEL FILTER
FUEL PUMP
FUEL INJECTORS
FUEL
RAIL
divides fuel between the pressure line and
the return line. The fuel in the pressure line
goes to the fuel injectors, while the fuel in the
return line is returned to the fuel tank.
Fig. 3 shows the orientation of fuel system
components in a typical “port” fuel injection
system.
PRESSURE
LINE
RETURN
LINE
FUEL
RAIL
PRESSURE
LINE
RETURN
LINE
FUEL PUMP FILTER
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