Opel Frontera UBS. Service manual — part 1341

6C – 6 ENGINE FUEL

FUEL FILTER

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(1) Priming Pump
(2) Fuel Filter Cartridge

A cartridge type fuel filter is used along with the piston
type fuel pump on the high pressure oil pump.
The fuel filter removes foreign material from the fuel
before it reaches the fuel pump.
A diaphragm type priming pump is installed at the top of
the fuel filter. It is used during the air bleeding
procedures.

INJECTOR ASSEMBLY

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(1) Oil Passage
(2) Fuel Passage

1. Construction of Fuel Injector

The fuel injector is comprised of the solenoid
section, hydraulic line, and fuel line. Fuel injection is
controlled by the continuity time signal and
continuity start timing signal sent by the ECM
(Electronic Control Module) to the solenoid.

2. Working of Fuel Injector

1) The ECM detects the working of the engine from

its input signals, such as engine speed
accelerator throttle opening, and engine coolant
temperature, sending the optimal signals to the
solenoid.

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ENGINE FUEL 6C – 7

2) With the current carried to the solenoid, a

poppet valve is opened by means of an
armature to let high-pressure engine oil into the
injector.

3) Under the oil pressure, the piston and plunger

are depressed to compress the fuel. The
pressure of the compressed fuel is increased
over the pressure of high-pressure engine oil by
the ratio (about 7 : 1) of piston top to plunger
bottom.

4) The injection nozzle end needle is lifted under

the increased pressure of the fuel for fuel
injection.

5) With current stopped from the ECM, the poppet

valve is closed which holds up the high-pressure
engine oil and lets the oil used to compress fuel
out of the injector through its drain hole.

6C – 8 ENGINE FUEL

ON-VEHICLE SERVICE

FUEL FILTER ASSEMBLY

REMOVAL

1. Disconnect battery ground cable.
2. Fuel Filler cap
3. Fuel Hose

1) Disconnect fuel hose from filter body.

Plug the hose ends to prevent fuel spillage.

4. Remove the Bolt on Fuel Filter Bracket
5. Remove Fuel Filter Assembly

INSTALLATION

1. Install the fuel filter assembly
2. Tighten the Fuel Filter Bracket Fixing Bolt
3. Fuel Hose

1) Connect hoses to filter body.

4. Fuel Filler Cap

1) Connect the battery ground cable.
2) Feed fuel to the fuel pump by priming, and bleed

the air from fuel system.

FUEL FILTER CARTRIDGE

DISASSEMBLY

1. Drain fuel completely from the fuel filter.
2. Protect the filter body with cloth and lightly grip with

a vise.

3. Remove the cartridge using a filter wrench.

Filter wrench: 5-8840-0203-0

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(1)

Priming Pump

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ENGINE FUEL 6C – 9

REASSEMBLY

1. Clean the cartridge mounting surface of the filter

body so that the cartridge can be secured.
Apply engine oil thinly to new cartridge O-ring.

2. To facilitate bleeding, fill the new cartridge with light

oil.

3. Tighten the cartridge until O-ring comes in contact

with the seal, taking care not to spill the light oil.

4. Retighten 1/3 – 2/3 using a filter wrench.

Filter wrench: 5-8840-0203-0

Bleeding

1. Loosen air bleeding plug.
2. Operate priming pump to bleed the air in the fuel

line.

3. Operate the priming pump until the fuel is overflow

from air bleeding plug.

4. Tighten the air bleeding plug.
5. Start the engine, and if it is not started in 10

seconds or less, repeat the bleeding steps.

6. Make sure of no fuel leakage, and tighten the

priming pump.

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(1) Priming Pump

NOTE: In comparison with the conventional engine,
the capacity of fuel passage in the 4JX1 engine is
larger. It takes the priming pump more time to fill the
engine with fuel.

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