Carbon MCS-352 Betreibershandbuch PDF herunterladen (Seite 48)

Leakdown Test

1. Verify that Setup Steps 1-10 from the appropriate previous chapter have been

completed for the specific fuel system type to be tested

2. Verify that the vehicle’s engine is running and check connections for leaks.

3. Turn off the vehicle.

4. Note the pressure reading on the unit’s Fuel Pressure gauge.

• The pressure should be maintained or increased due to heat expansion.

• On CIS systems the pressure will drop to a point then stabilize (see manufactures specifications for

this amount).

If a pressure drop occurs, this indicates a leak in the system. To isolate the leak you

will need to re-pressurize the system. Use the procedures below to re-pressurize the

system:

• Press and hold the

Start/Run button.

• Turn the

Pressure Adjust regulator clockwise until the unit’s Fuel Pressure gauge displays

3/4 of the pressure noted in Step 4.

• Release the

Start/Run button.

• Press the ▬ button to decreases the time until the

Time LED displays five minutes.

• Press the

Leak Test button on the unit’s control panel.

Use the procedure above to re-pressurize the system whenever there is significant

drop in pressure during the Leakdown test.

Once you have re-pressurized the system, use the procedures below to isolate the leak.

• Locate the pressure line adaptor closest to the T-adaptor (#060-4500) and the vehicle’s fuel tank.

Bend the pressure line adaptor in half and squeeze tightly. If the pressure stabilizes, this indicates a

leak in either the pressure fuel line or a bad one-way check valve in the vehicle’s fuel pump.

• Locate the return line adaptor close to the pressure regulator. Bend the return line adaptor in half and

squeeze tightly. If the pressure stabilizes, this indicates a leak in the vehicle’s pressure regulator.

This problem is generally dirt-related and should be resolved by the cleaning process. However, if

fuel is present in the vacuum line from the regulator, this indicates a leaking diaphragm.

DISTRIBUTED BY: TOTAL FACILITY SOLUTIONS | 1(800) 274-8730 | WWW.LIFTANDAIRCOMPRESSOR.COM

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Carbon MCS-352 Betreibershandbuch Seite 48