A4 Mk2
| Suction-jet pump |
| 1 - | Suction-jet pump (left-side) |
| t | On vehicles with four-wheel drive the fuel tank is divided into a left and a right chamber. |
| t | A so-called suction-jet pump -1- is used for delivering the fuel from the left fuel tank chamber to the baffle housing of the fuel delivery unit -8- on the right. |
| t | A second suction-jet pump -7- is located in the right fuel tank chamber and serves to improve the fuel delivery in the right fuel tank chamber to the baffle housing of the fuel delivery unit. |
| t | The suction-jet pumps operate according to the principle of fluid entrainment: a stream of fuel from the fuel return pipe -3- is passed through a nozzle in the suction jet pumps -1- and -7-, and is thus accelerated. The accelerated stream of fuel draws off the surrounding fuel and delivers it to the baffle housing of the fuel delivery unit. The right suction-jet pump -7- delivers the fuel directly into the baffle housing, the left suction-jet pump -1- delivers the fuel via a separate pipe -4-. |
| t | The fuel is distributed from the return pipe to the two suction-jet pumps via the Y-connector -2-. At the same time the connecting piece -6- limits the pressure in the pipes leading to the suction-jet pumps to approx. 1 bar. Excess fuel is delivered directly to the baffle housing via another pipe. |
Note| The -arrow- points in direction of travel. |
