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Idiomas disponibles
Idiomas disponibles
IMPORTANT SAFEGUARDS
People with electronic devices, such as pacemakers,
should consult their physician(s) before using this
product. Operation of electrical equipment in close
proximity to a heart pacemaker could cause interfer-
ence or failure of the pacemaker.
WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.
WORK AREA
Keep your work area clean and well lit. Cluttered work
benches and dark work areas may cause accidents or injury.
Always work in a well ventilated area. Do not operate
vehicle in an enclosed space. Inhaling fuel vapor and/
or exhaust gases can cause serious injury.
Do not smoke or have open flames around vehicle.
Flammable vapors from spilled fuel or charging batteries may
cause an explosion.
Keep children and bystanders away. Never leave the
vehicle unattended during testing.
Always have the right kind of fire extinguisher on hand.
Make sure it is rated for putting out chemical/fuel/electrical fires.
ELECTRICAL SAFETY
Avoid body contact with grounded surfaces. There is an
increased risk of electric shock if your body is grounded.
Do not expose electronic devices to rain or wet con-
ditions. Water entering an electronic device will increase the
risk of electric shock.
Always turn the ignition OFF before attaching or
removing any testing equipment.
Never lay tools on the vehicle battery. If the metal con-
nects the terminals, the battery will short causing injury to the
user and damage to the tool and battery.
DO NOT touch the distributor cap, ignition coil, spark
plugs or ignition wires while testing. These parts will
contain extremely high voltage when the motor is running.
PERSONAL SAFETY
Stay alert, watch what you are doing, and use common
sense while testing. Do not use test while tired or
under the influence of drugs, alcohol or medication.
A moment of inattention while testing the fuel pressure may
result in serious personal injury.
Dress properly. Do not wear loose clothing or jewel-
ry. Contain long hair. Keep your hair, clothing, and
gloves away from moving parts.
Do not overreach. Keep proper footing and balance
at all times.
Always wear eye protection. Everyday eyeglasses only
have impact resistant lenses, they are NOT safety glasses.
Never handle fuel injectors until all residual pres-
sure has been relieved. Pressure will remain in the system
even when the vehicle engine has been shut off. Failure to relieve the
pressure can lead to serious injury.
DO NOT allow fuel to puddle on the floor. Use bleed-
off hose to drain excess fuel into a fuel-safe container during
testing.
DO NOT spill fuel on hot engine parts. If a spill happens,
turn off the engine immediately and clean up the spilled fuel
with a disposable rag.
DO NOT allow your body, tools or test equipment to come
in contact with hot or moving engine parts. Serious injury
could occur.
Make sure the vehicle will not move while you are
working on it. Automatic transmission cars should be in PARK.
Manual transmission cars should be in NEUTRAL. Always block
the vehicle's wheels.
DO NOT touch the distributor cap, ignition coil, spark
plugs or ignition wires while testing. These parts will con-
tain extremely high voltage when the motor is running.
Perform all the Pre-Test Inspections before doing
any testing.
Use caution when working around air bag components.
Even when the engine is turned off, the air bags may still deploy if
mishandled.
Consult the owner's manual for important warnings and
service procedures provided by the vehicle manufacturer.
1
FUEL SYSTEM COMPONENTS
Before testing, take a moment to review how the fuel system com-
ponents work. The fuel pump feeds fuel from the gas tank to the fuel
pressure regulator. The fuel pressure regulator divides the fuel between
the pressure line and the return line. The fuel pressure line takes fuel
to the fuel injectors. The return line sends excess fuel to the gas tank.
FUEL TANK: Large container which holds a vehicle's fuel supply.
FUEL PUMP: Electric motor which pumps fuel into the fuel system
at a constant pressure. Usually mounted in the fuel tank or on the
vehicle's frame. Some vehicles will have more than one fuel pump.
FUEL PUMP FILTER: Fuel filter usually located in the fuel tank.
It prevents foreign particles from reaching the fuel pump. If the fuel
pump filter is clogged, it can cause low fuel pressure readings.
When replacing the fuel pump, it is a good idea to also replace the
fuel pump filter.
RETURN LINE: Line to return excess fuel to fuel tank.
PRESSURE LINE: Pressured line which carries fuel from the fuel
tank to the injectors.
FUEL FILTER: Filter that prevents foreign particles from reaching
the fuel injectors. It is located in-line with the pressure line. If the fuel
filter becomes clogged or restricted, the fuel pressure readings will be
low. This is the only fuel system component that requires periodic
replacement. Refer to vehicle owner's manual for replacement details.
FUEL RAIL TEST PORT: Schrader valve located on the fuel rail.
Allows easy connection of the fuel pressure gauge for fuel pressure
testing. Not the same as the Schrader valves used for recharging air
conditioning systems.
FUEL
PRESSURE
REGULATOR:
regulator is connected to both the pressure line and the return
line. A spring-loaded valve assembly opens to expel excess
fuel when the pressure line fuel pressure is exceeded. The
regulator keeps a constant fuel pressure drop across the
fuel injectors. A leaking regulator can cause low fuel pressure
readings or make the vehicle hard to start. Some fuel regulators are
vacuum-actuated (compensated). These regulators have a vacuum port
so fuel pressure can be adjusted based on the load on the engine.
FUEL RAIL: The fuel rail assembly delivers fuel to the fuel injectors
and holds them in place. It is bolted to the intake manifold.
FUEL INJECTORS: Precision valves that are controlled by a solenoid.
Fuel injection is controlled by the amount of fuel pressure, and the size
and duration of the valve opening. Leaking fuel injectors will cause fuel
pressure to slowly decrease when the ignition key is on and the engine
is off. Fuel injectors contain a filter used to prevent tiny particles from
clogging the valve.
The
fuel
pressure
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