3232836 - 1040A fuel tank and components

CONSTRUCTION FEATURES

Immersed pump unit complete with fuel gauge sender unit

It mainly consists of:

  • an electric fuel pump (1)
  • a fuel filter (2)
  • a float type fuel gauge (3)
  • a diaphragm pressure regulator (4) (set to 4.3 bars)
  • a mesh pre-filter (5).
an O-Ring ensures a seal between pump cover and tank.

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 weightsmall size

Inertial switch

In the case of an impact, the inertia switch, fitted under the driver's seat, interrupts the connection to earth for the electric fuel pump and consequently the supply to the injection system.
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.