Component description for the fuel tank - GF47.10-P-2000AMG
MODEL 164 with ENGINE 156.980
MODEL 251 with ENGINE 156.980
Shown on fuel tank model 164
Location
The saddle-shaped fuel tank with a fill quantity of around 95 liters is located on the underbody in front of the rear axle.
Design
It consists of double-layer plastic and is divided into two fuel tank chambers.
The lines and filler necks are connected to the fuel tank via Quick-connect connections. To loosen the lines, the connections must be pinched and removed.
The filler neck is locked with a wire clamp. When the filler neck is removed, a check valve in the fuel tank closes.
One filling valve is located at the three highest locations in the fuel tank. The filling valves close off the ventilation system when the maximum fuel level is not reached when the tank is refueled. The fuel rises rapidly in the filler neck, the nozzle closes and overfilling is prevented.
Rollover valves close off the ventilation system in the event of an accident to prevent fuel leaking from the tank.
Both fuel pumps are installed in the fuel feed module.
Each fuel tank chamber contains a fuel level indicator for detection of the fuel level.
Fuel tank model 251
The fuel tank of model 251 has a model-specific adapted outer structural shape. Inside, however, it is just the same as the fuel tank for model 164.
Emptying
The fuel tank has no outlet valves. It emptying takes place through fuel pumps via the fuel line in the engine compartment or via a corresponding air extractor system.
Function
Fuel supply is controlled and monitored by the ME-SFI [ME] control unit (N3/10) and the left and right fuel pump control units (N118/3, N118/4). The fuel pressure is regulated to be variable from between 4 and 5.5 bar depending on the power requirements.
A fuel strainer is installed at the bottom in the fuel delivery module at the feed to the fuel pump.
Fuel pumps draw the fuel at the bottom out of the fuel feed module and deliver it through fuel filter with pressure limiting valve to the fuel injection valve (Y62) on the fuel manifold (single-line system). In doing so, the fuel pressure is limited by the pressure limiting valve to approx. 6.0 bar.
A junction in the fuel line upstream of the fuel filter provides the suction jet pump in the left fuel tank chamber with part of the flow the fuel feed. The suction jet pump delivers the fuel out of the left fuel tank chamber into the fuel feed module (right fuel tank chamber).
Furthermore the fuel feed module is filled by a suction jet pump in the right fuel tank chamber. This suction jet pump is driven by a part of the flow of the fuel feed from the left fuel pump.
The housing of the fuel delivery module serves as a swirl pot. The swirl pot prevents the fuel pump from drawing air while cornering with a low level of fuel in the fuel tank.