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START AND IDLE PRESSURE MEASUREMENT
PREPARATION
1. Attention: allow the common rail system to become depressurized before connecting the dial
gauge unit (see Fig. 1).
2. Connect measurement hose (2) to the pressure gauge (1), high pressure pump and rail.
3. As an alternative to this, the measurement hoses (2) can also be connected to the rail and
injector.
4. When the fuel system is depressurized, disconnect the accessible high pressure line and connect
the pressure gauge either with the M12 or M14 measurement hoses (2).
5. Make sure that all hose connections are screwed tight before continuing.
6. Connect the diesel collecting bottle to the transparent hose at the bottom connection of the dial
gauge unit. The bottle collects the diesel fuel when the pressure relief valve in the dial gauge unit
opens.
7. Start the engine. Due to the air in the system, it may take several seconds until the engine starts.
8. Check the dial gauge unit and measuring hoses for leaks.
9. Switch off the engine if a fuel leak is determined.
10. Leave the system depressurized before eliminating the leak.
11. Start the engine and check the system for leaks again.
MEASUREMENT
1. Start the engine and observe the pressure gauge.
2. When starting the engine and at idle, the measured value must be at approx. 300 bar.
3. Increase the engine speed and observe that the fuel pressure increases accordingly.
4. If this pressure is correct, we can conclude that the low-pressure circuit is operating correctly and
that the high pressure pump is building up the minimum pressure required to start the engine.
5. If the pressure is correct but the engine does not start, this problem may however, be electrical,
an injector, etc.
6. If the necessary pressure is not built up, you should carry out the following steps:
a. Check the pressure at the fuel inlet of the high pressure pump using a low pressure tester
(not included in the scope of supply).
b. If the pressure at the fuel inlet of the high pressure pump is correct, you will have to check
the maximum pressure of the pump (see chapter "MAXIMUM PRESSURE
MEASUREMENT").
FIGURE 1
Connect to the outlet
of the high pressure
BGS technic KG
Bandwirkerstr. 3
D-42929 Wermelskirchen
pump
Tel.: 02196 720480
Fax.: 02196 7204820
mail@bgs-technic.de
Connect to the
inlet of the
distributor pipe
(rail)
Collecting bottle
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