audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Removing and installing suction-jet pump > < Removing and installing fuel gauge sender 2 G169

A3 Mk1

Suction-jet pump: operation
Suction-jet pump: operation
The electric fuel pump sends a pressurised stream of fuel into the suction-jet pump (entrainment pump) in the left chamber of the tank.
The suction-jet pump delivers the fuel from there into the right chamber, and from the right chamber it is drawn into the fuel delivery unit.
Faults caused by defective suction-jet pump
  WARNING
If the suction-jet pump is defective, the engine can stop due to fuel starvation when the tank is still 1/4 full.
   
If suction-jet pump -2- is not working, up to 15 litres of fuel -3- (up to 1/4 of tank capacity) may remain in the left chamber of the tank, where it cannot be drawn into the fuel delivery unit.
If the engine stops due to fuel starvation with the tank up to about 1/4 full, proceed as follows:
–  Check fuel pump → Chapter.
If fuel pump is OK, but no fuel is delivered:
–  Put another 5 litres (approx.) of fuel into tank.
–  Start engine.
–  If engine does start now, renew suction-jet pump → Chapter.
  A20-0387

Removing and installing suction-jet pump > < Removing and installing fuel gauge sender 2 G169