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CC 2012 ➤ , Passat 2011 ➤ , Passat Variant 2011 ➤
Fuel supply system, petrol engines - Edition 05.2019
On vehicles with four-wheel drive the fuel tank is divided into a
left and a right chamber. Use suction-jet pump -2- to move fuel
from left fuel tank chamber to baffle housing of fuel delivery unit
-1- on right.
Function of suction-jet pump
The suction-jet pump operates according to the principle of fluid
entrainment: the stream of fuel from the electrical fuel pump is
passed through a nozzle in the suction-jet pump, and is thus ac‐
celerated. The accelerated stream of fuel draws off the surround‐
ing fuel and delivers it to the baffle housing of the fuel delivery
unit.
Faults caused by defective suction-jet pump
Note
Risk of breakdown due to defective suction-jet pump.
♦
If the suction-jet pump is defective, the engine can stop due to
♦
fuel starvation when the tank is still
If suction-jet pump does not work, approx. 15 litres of fuel remain
in left chamber of fuel tank and cannot be extracted by fuel de‐
livery unit.
If the engine stops due to fuel starvation with the tank filled up to
1
about
/ 4 , proceed as follows:
– Use ⇒ Vehicle diagnostic tester to check fuel pump.
If fuel pump is OK, but no fuel is delivered:
– Refill fuel tank with approx. 5 litres of fuel.
– Start engine.
If engine starts OK now:
– Renew suction-jet pump as described below.
Removing suction-jet pump
– Drain fuel tank
⇒ "1.2 Emptying fuel tank", page 14
– Remove bench seat or fold it upwards ⇒ General body repairs,
interior; Rep. gr. 72 ; Rear seat; Removing and installing
bench seat / individual seats .
– Guide carpet out and fold upwards, if fitted.
– Remove fuel delivery unit
⇒ "2.2 Removing and installing fuel delivery unit, fuel gauge
sender", page 43
.
– Unclip right cover -1- at retaining tabs -arrows-, using removal
wedge - 3409- .
108
Rep. gr.20 - Fuel supply system
1
/ 4 full.
.
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