30 Testing and adjusting SEN00455-01
114E-3 Series
13
Testing fuel pressure 1
a Testing tools for fuel pressure
a Test only the fuel pressure in the negative
pressure circuits from the fuel supply connec-
tor and feed pump and in the low-pressure cir-
cuit from the feed pump through the fuel main
filter and supply pump.
k Since the pressure in the high-pressure cir-
cuit from the fuel supply pump through the
common rail to the injector is very high, it
cannot be measured.
1. Testing fuel negative pressure circuit pres-
sure (fuel supply connector)
1) Remove fuel pressure pickup plug (1)
from the fuel supply connector.
2) Connect M10 computer check fitting G4 to
fuel vacuum gauge G5.
3) Run the engine at high idle and test the
fuel negative pressure circuit pressure.
a If the fuel negative pressure circuit
pressure is in the following range, it is
normal.
q Standard value of fuel negative pres-
sure circuit pressure (fuel supply con-
nector):
Max. 27.1 kPa {Max. 203 mmHg}
4) After finishing testing, remove the testing
tools and return the removed parts.
3 Fuel pressure pickup plug:
20 – 22 Nm {2.0 – 2.2 kgm}
2. Testing fuel negative pressure circuit pres-
sure (supply pump)
1) Remove fuel pressure pickup plug (2)
from the supply pump.
Symbol Part No. Part name
G
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2
6732-81-3170
Adapter
(10 x 1.0 mm o PT1/8)
6215-81-9710 O-ring
3 799-401-2320
Gauge: 1 MPa {10 kg/cm
2
}
4 795-790-6210 M10 computer check fitting
5
795-790-1500
Fuel vacuum gauge
799-201-1201
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