223000226 - INTRODUCTION - FUEL TANK AND COMPONENTS (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).
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.

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.