INTRODUCTION - FUEL TANK AND COMPONENTS

1.2 8v · BIPOWER

COMPOSITION

It is mainly composed of:

• an electric fuel pump (1)
• a fuel filter (2)
• a float type fuel gauge (3)
• a diaphragm pressure regulator (4)
• a mesh pre-filter (5).

GAUGE ELECTRICAL VALUES

The figure below illustrates the electrical connections of the pump assembly, while the table indicates the sensor''s resistance values in relation to the fuel level.

Electric fuel pump

The fuel pump comprises a permanent-magnet electric motor (1) which controls the pump impeller (2), and a terminal-carrier cover (3), which contains the electrical and hydraulic connections.

The pump stage is the single type with peripheral flow, with high performance in low voltage and temperature conditions.

Its advantages compared with pumps operating in accordance with the positive-displacement principle are:

• light weight
• small in size.

Electric fuel pump

SPECIFICATIONS

• Capacity 110 l/h
• Pressure 3.5 bar
• Voltage 12 V
• Current = 7.5 A

The inertia switch, fitted on the right under the dashboard on the passenger side, interrupts the connection to earth for the fuel pump and consequently the supply to the injection system, in the case of an impact to the vehicle.

A steel ball (1) mounted in a conical housing (2) is normally locked by the attraction force of an adjacent magnet.

Under specific acceleration loads, the ball is released from the magnetic lock and gradually emerges from the conical housing in an upward movement, following the angle of the cone.

Above the ball, there is a quick-trip mechanism (3) which forms the normally closed (N.C.) electric circuit.

When the mechanism is struck by the ball, it changes position from an N.C. circuit to a normally open (N.A.) circuit, breaking the fuel pump''s earth circuit.

The switch can be reset by pressing a button protected by a soft cover (4).

1.6 16v · BIPOWER

COMPOSITION

It is mainly composed of:

• an electric fuel pump (1)
• a fuel filter (2)
• a float type fuel gauge (3)
• a diaphragm pressure regulator (4)
• a mesh pre-filter (5).

GAUGE ELECTRICAL VALUES

The figure below illustrates the electrical connections of the pump assembly, while the table indicates the sensor''s resistance values in relation to the fuel level.

Electric fuel pump

The fuel pump comprises a permanent-magnet electric motor (1) which controls the pump impeller (2), and a terminal-carrier cover (3), which contains the electrical and hydraulic connections.

The pump stage is of the single type with peripheral flow, with high performance under low voltage and temperature conditions.

Its advantages compared with pumps operating in accordance with the positive-displacement principle are:

• light weight
• small in size.

Electric fuel pump

Specifications

• Capacity 110 l/h
• Pressure 3.5 bar
• Voltage 12 V
• Current = 7.5 A

The inertia switch, fitted on the right under the dashboard on the passenger side, interrupts the connection to earth for the fuel pump and consequently the supply to the injection system, in the case of an impact to the vehicle.

A steel ball (1) mounted in a conical housing (2) is normally locked by the attraction force of an adjacent magnet.

Under specific acceleration loads, the ball is released from the magnetic lock and gradually emerges from the conical housing in an upward movement, following the angle of the cone.

Above the ball, there is a quick-trip mechanism (3) which forms the normally closed (N.C.) electric circuit.

When the mechanism is struck by the ball, it changes position from an N.C. circuit to a normally open (N.O.) circuit, breaking the fuel pump''s earth circuit.

The switch can be reset by pressing a button protected by a soft cover (4).

1.3 JTD 16V · BIPOWER

SUBMERGED PUMP ASSEMBLY COMPLETE WITH FUEL GAUGE SENDER UNIT

The fuel pump forms a single assembly with the fuel gauge sender unit and fuel filter; the components cannot be replaced individually.

ELECTRIC FUEL PUMP

The fuel pump comprises a permanent-magnet electric motor (1) which controls the pump impeller (2), and a terminal-carrier cover (3), which contains the electrical and hydraulic connections.

The pump stage is of the single type with peripheral flow, with high performance under low voltage and temperature conditions.

Its advantages compared with pumps operating in accordance with the positive-displacement principle are:

• light weight;
• small in size.

INERTIA SWITCH

The inertia switch is fitted on the diver''s side near the bolt fixing the running board to the front door pillar. In the case of an impact to the vehicle, it interrupts the connection to earth for the electric fuel pump and consequently the supply of fuel to the injection system.

INERTIA SWITCH

A steel ball (1) mounted in a conical housing (2) is normally locked by the attraction force of an adjacent magnet.

For specific acceleration loads, the ball is released from the magnetic clip and gradually comes out of the conical housing in an upwards movement following the angle of the cone.

Above the ball, there is a quick-trip mechanism (3) which forms the normally closed (N.C.) electric circuit.

When the mechanism is struck by the ball, it changes position from an N.C. circuit to a normally open (N.O.) circuit, breaking the fuel pump''s earth circuit.

The switch can be reset by pressing a button protected by a soft cover (4).

INERTIA SWITCH

1.6 16v · BIPOWER

FUEL TANK

The fuel tank is made of a plastic material with high mechanical strength; on the Doblò version it is located in front of the rear axle and has a capacity of about 60 litres, while on the Doblò Cargo version it is located behind the rear axle and has a capacity of about 30 litres.

It is fitted with a flexible filler and includes the seating for fitting the fuel pump assembly. It also has housings for the fuel anti-evaporation system components.

SUBMERGED PUMP ASSEMBLY COMPLETE WITH FUEL GAUGE SENDER UNIT

It is mainly composed of:

• an electric fuel pump (1)
• a fuel filter (2)
• a float type fuel gauge (3)
• a diaphragm pressure regulator (4)
• a mesh pre-filter (5).

ELECTRIC FUEL PUMP

The fuel pump comprises a permanent-magnet electric motor (1) which controls the pump impeller (2), and a terminal-carrier cover (3), which contains the electrical and hydraulic connections.

The pump stage is of the single type with peripheral flow, with high performance under low voltage and temperature conditions.

Specifications

• Capacity 110 l/h
• Pressure 3.5 bar
• Voltage 12 V
• Current = 7.5 A

Its advantages compared with pumps operating in accordance with the positive-displacement principle are:

• light weight
• small in size.

INERTIA SWITCH

In the event of a crash, the inertia switch, mounted on the right wing under the dashboard on the passenger side, breaks the fuel pump earth connection, closes the solenoids of the cylinders (two for the Doblò version, three for the Doblò Cargo version) and of the pressure adaptor and consequently the supply to both systems.

INERTIA SWITCH

A steel ball (1) mounted in a conical housing (2) is normally locked by the attraction force of an adjacent magnet.

Under specific acceleration loads, the ball is released from the magnetic lock and gradually emerges from the conical housing in an upward movement, following the angle of the cone.

Above the ball, there is a quick-trip mechanism (3) which forms the normally closed (N.C.) electric circuit.

When the mechanism is struck by the ball, it changes position from an N.C. circuit to a normally open (N.O.) circuit, breaking the fuel pump''s earth circuit.

The switch can be reset by pressing a button protected by a soft cover (4).

Even after an apparently minor impact, if there is a smell of fuel or leaks are noticed from the fuel system, do not turn the switch back on, but search for the cause of the problem and remedy it to prevent the risk of fire. Otherwise, if there are no leaks and the vehicle can be restarted, press the button to reactivate the pump.

1.4 8v

SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE

Composition

This essentially consists of:

- an electric fuel pump

- a fuel filter

- a float-type level gauge

- a diaphragm pressure regulator

- a mesh prefilter

1. Float level sensor

2. Supply connector

3. Electrical connection

Fuel pump

The fuel pump is equipped with a permanent magnet electric motor (1) that controls the pump (2) and a terminal mount cover (3) that contains the electrical and hydraulic connections.

The pump stage is single, peripheral flow type with high performance under low voltage and temperature conditions.

The advantages compared to pumps that operate on volumetric princples are as follows:

- reduced weight

- limited size.

Specifications:

- Capacity = 110 l/h

- Pressure 3.5 bar

- Voltage 12 V

- Current = 7.5 A

Inertia switch

The inertia switch is fitted on the passenger side near the front door pillar. If the vehicle is involved in an impact, it interrupts the connection to earth of the fuel pump and, as a result, the supply of fuel to the injection system.

A steel ball (1) fitted in a tapered housing (2) is normally held in place by the attractive force of an adjacent magnet.

Under specific deceleration loads, the ball is released from the magnetic detent and gradually emerges from the tapered mount. Its upward movement is dependent on cone angle.

A rapid release mechanism (3) over the ball forms a normally closed (NC) electrical circuit.

When struck by the ball, the mechanism changes position from a NC circuit to a normally open (NA) circuit and breaks the fuel pump earth circuit.

The switch may be reset by pressing a button protected by a flexible cover (4).

If a smell of fuel or fuel system leaks are noted after even an apparently slight impact, do not reset the inertia switch but find and repair the fault to prevent the risk of fire. Otherwise, if no leaks are noted and the vehicle can be driven away, press the button to reactivate the pump.