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 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).
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.