Description
Fuel pump
(1) fuel pump
"a" 6-way black connector
"A" fuel inlet
"B" fuel outlet
Make: TI AUTOMOTIVE
The fuel pump is submerged inside the fuel tank
NoteThe fuel filter is integral to the fuel pump
Fuel gauge
(2) fuel gauge
"a" 6-way black connector
Make: TI AUTOMOTIVE
The fuel gauge is fixed on the fuel pump inside the fuel tank
Fuel pressure regulator
(3) fuel pressure regulator
Make: TI AUTOMOTIVE
The fuel pressure regulator is incorporated in the fuel tank unit assembly
Role
Fuel pump
The role of the fuel pump is to deliver fuel to the supply rail of the petrol injectors
A non-return valve incorporated in the fuel pump on the fuel delivery circuit, maintains a residual pressure inside the circuit supplying fuel to the engine
Fuel gauge
The fuel gauge is for determining the level of fuel in the tank
Fuel pressure regulator
The fuel pressure regulator regulates the pressure of petrol in the rail supplying the petrol injectors
Function
Fuel pump
The fuel pump is powered by a direct current motor
The electrical control is all-or-nothing thanks to a power relay
The motor speed is defined by its resistance
The condenser and coils assembly smoothes out the input signal
(1) fuel pump
(3) fuel pressure regulator
(4) fuel filter
"A" fuel inlet
"B" fuel outlet
Direction of fuel circulation
- Fuel supply (at "A")
- Suction of the fuel by the fuel pump (1)
- Filtration of the fuel through the fuel filter (4)
- Filling of the chamber which leads to the fuel pressure regulator (3)
- Fuel outlet (at "B")
Fuel gauge
(2) fuel gauge
"b" float at the minimum level
"c" float at the maximum level
Depending on the level of fuel in the tank, the position of the floater changes, this varying the resistance value of the fuel gauge
This resistance value allows the level of fuel in the tank to be deduced
Fuel pressure regulator
(1) fuel pump
(3) fuel pressure regulator
(4) fuel filter
(5) push spring
(6) return spring
"A" fuel inlet
"B" fuel outlet
"C" fuel pressure regulator inlet
"D" action in event of overpressure
When the pressure becomes too great in the fuel pump
- The pressure of fuel pushes on the membrane (at "D")
- The push spring (5) just behind the membrane is decompressed
- The push spring (5) pushes on the return spring (6)
- The slide valve gradually closes
The return spring (6) goes back to its rest position when the pressure in the fuel pump has dropped below 3,5 bars
Electrical features
Fuel pump
"E" earth
"F" supply
"G" earthing
"H1" the capacitor (0,47 microfarad)
"H2" coils
| designation | value |
|---|---|
| supply voltage | 13,5 V |
| operating range | 8 to 16 volt |
| output pressure | 3,5 bars |
| maximum flow/hour | 45 litres |
Fuel gauge
"J" earth
"K" fuel level information
"L" fuel gauge
| designation | value |
|---|---|
| supply voltage | 13,5 Volts |
| operating range | 8 à 16 Volts |
"H" depth of fuel in the tank (mm)
"R" resistance (ohm)
| depth of fuel in the tank | minimum resistance | nominal resistance | maximum resistance |
|---|---|---|---|
| 207,3 mm (fuel tank full) | 48 ohms | 50 ohms | 52 ohms |
| 170,4 mm | 94,5 ohms | 101,7 ohms | 108,9 ohms |
| 105,3 mm | 192 ohms | 200 ohms | 208 ohms |
| 44,3 mm | 289,6 ohms | 298,3 ohms | 307 ohms |
| 13,5 mm (empty fuel tank) | 345 ohms | 350 ohms | 355 ohms |
The resistance value reduces when the depth of fuel in the tank increases
The resistance value increases when the depth of fuel in the tank reduces
| channel number | allocation of channels of connector |
|---|---|
| 3 | battery + supply |
| 4 | earth |
| 5 | earth |
| 6 | fuel level information |
Programming/initialisation
Not applicable