| Pos. | spare part no | Name |
| 1 | - | Fuel tank vent valve |
| 2 | - | cross pipeline |
| 3 | - | Coarse filter |
| 4 | - | Fuel level sensor float (2 pcs.) |
| 5 | - | MAPPS type fuel gauge sensor (magnetic passive position sensor) (2 pcs.) |
| 6 | - | Fuel tank vent hose |
| 7 | - | Fuel supply module |
The fuel tank consists of the following internal elements:
- Internal support bracket
- Fuel delivery module and cross pipe
- Two MAPPS type fuel gauge sensors
- Breather
Internal support bracket
An internal support bracket is molded into the tank body to accommodate the breather and crosspipe assembly.
Fuel supply module
| Pos. | spare part no | Name |
| 1 | - | Supply from the pump built into the tank to the transfer pump |
| 2 | - | Fuel supply to the engine fuel filter |
| 3 | - | Pump located in the fuel tank |
| 4 | - | Supply from the pump built into the tank to the transfer pump |
| 5 | - | transfer pump (useful side of the tank) |
| 6 | - | Inlet from the useful side of the tank |
| 7 | - | Fuel return from engine fuel filter |
| 8 | - | cross pipeline (from the usable side of the tank) |
| 9 | - | transfer pump (unused tank side) |
The fuel delivery module is located on the right side of the tank and is attached to the bottom of the tank with a welded bayonet type locking ring. The top flange of the fuel delivery module assembly provides the interface between the tank's internal and external electrical and fuel connections. The flange is equipped with a 6-pin external electrical connector, which is connected to two MAPPS fuel level sensors and a pump built into the tank.
The flange of the fuel supply module is sealed against the tank with a sealing ring and secured with a retaining ring.
The lower part of the fuel supply module forms the fuel supply reservoir and serves to accommodate the pump built into the tank and two transfer pumps. The fuel supply reservoir provides permanent storage for fuel drawn in by the engine. The supply and return fuel lines of the engine are immersed in the fuel supply tank.
The tank is kept full by two transfer pumps. An in-tank pump draws fuel from the supply tank and "drives" through two transfer pumps. The flow of fuel through each transfer pump creates a suction effect that draws fuel from both sides of the fuel tank into the fuel supply reservoir. Excess fuel entering the fuel supply reservoir flows to the usable side of the fuel tank.
The valve is located at the bottom (on the usable side of the tank) supply port of the transfer pump. The valve is open when the in-tank pump is activated and the lower transfer pump supplies fuel to the fuel supply reservoir. When the in-tank pump is turned off, the valve closes to prevent fuel from draining from the fuel supply reservoir.
The in-tank pump is powered by the fuel pump relay located in the central electrical box (CJB). Engine control module (ECM) energizes the fuel pump relay whenever the ignition is set to power mode 4 (food accessories) or to mode 9 (engine cranking). For more information see the chapter: Electronic Engine Controls - 2.2L Diesel (303-14 Electronic Engine Controls - 2.2L Diesel, Description and function).
The modified fuel delivery module, which is installed on vehicles operating in cold climates, includes an additional fuel-fired heater and an auxiliary fuel pump. The modified fuel delivery module has a separate fuel supply line connected to an auxiliary fuel pump that is mounted externally on the right side of the tank. The auxiliary fuel line connects the auxiliary fuel pump to the fuel-fired auxiliary heater. For more information, see chapter: Auxiliary Fuel Heater (412-02 Additional climate control, Description and principle of operation).
Fuel Gauge Sensors
Two MAPPS fuel gauge sensors are located on both sides of the saddle-shaped tank and are connected to internal electrical connections on the fuel delivery module flange. Each sensor sends an electrical signal to the CJB that is proportional to the level of fuel on the corresponding side of the tank.
The actual fuel level in the tank is calculated in the CJB and this information is transmitted via the medium speed CAN bus to the instrument panel.
The control lamp installed in the instrument panel turns on when the amount of fuel in the tank falls to a predetermined level or below. On vehicles equipped with an instrument panel "high series", to inform the driver that fuel needs to be replenished, a message is displayed and a warning tone sounds.
For more information, see chapter: Instrument panel (413-01 Instrument panel, Description and function), Information and message center (413-08 Information and Message Centre, Description and Operation).
Vent valve (breather) fuel tank
The vent valve is located in the fuel tank and is connected to the fuel delivery module flange with an internal vent hose. The vent valve allows air to escape and then enter the fuel tank to compensate for changes in tank volume.
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