Draper 35891 handleiding
Handleiding
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7. Fuel Systems Testing
The vacuum tester can be used to evaluate the condition
of a mechanical fuel pump by testing the vacuum that it
is able to create.
• Locate and remove the suction line from the pump.
Connect the vacuum tester to the suction port of the
pump, start and run the engine at idle.
• The vacuum reading observed will vary depending on
the make and model being tested but as a general rule
approximately 15inHg of vacuum should be created.
This should also be held for approximately 1 minute
after the engine shuts down. If this vacuum reading is
not achieved or the vacuum drops o immediately
with the engine shut down, the fuel pump requires
either an overhaul or replacement.
7.1 Carburettor Testing
The vacuum test kit allows quick and accurate testing of
many dierent types of vacuum control systems used on
carburettors. Examples of tests that can be carried out;
• TestingaChokeBreakDiaphragm.
− With the engine o and at normal operating
temperature, disconnect the vacuum line to the
diaphragm module. Connect the vacuum tester
and apply approximately 15inHg of vacuum
and wait for 30 seconds.
− No drop in gauge reading should be observed.
With the vacuum still applied ensure that the
choke buttery is pulled to the fully open position.
• TestingVacuumOperatedCarburettorSecondary
Barrel.
− With the engine o and at normal operating
temperature, remove the vacuum line from the
secondary diaphragm module. Connect the
vacuum tester, hold the throttle and secondary air
valve aps open.
− Operate the hand pump whilst observing whether
the secondary throttle buttery opens freely.
7.2 Fuel Injection Pressure
Regulator Testing
Multi-point fuel injection rail pressure varies to suit
changing engine loads and fuel delivery requirements.
This is done using a vacuum operated regulator which is
connected to the engine manifold vacuum to sense the
varying loads.
a. To test the fuel rail pressure, attach a gauge to the
rail, then the engine loads must be created to vary
the engine manifold vacuum.
b. Remove and block o the vacuum supply line to
the pressure regulator.
c. Then connect and operate the vacuum pump to
simulate vacuum pressures in accordance with the
manufacturer’s specication. Note: any variation in
fuel pressure reading.
7.3 Emission Control Exhaust Gas
Recirculation Valve (EGR)
• Start the engine and run at idle until normal operating
temperature is reached. Remove the vacuum line from
the EGR valve and attach the vacuum test kit.
• Operate the hand pump to apply approximately
15inHg of vacuum. If the EGR valve is working
correctly the engine idle will become rough. If the idle
remains unchanged the valve is possibly seized in the
closed position. If the vacuum is not held, the
diaphragm in the valve has failed.
7.4 One-Way Valve Testing
Many vacuum operated circuits use in-line one way
valves to apply vacuum in one direction only.
• To test the function of the valve remove it from the
circuit. Attach the vacuum tester and operate pump to
apply vacuum. The valve should only hold vacuum in
one direction.
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EN
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Productinformatie
| Merk | Draper |
| Model | 35891 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 1727 MB |
