Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Suction jet pump-all wheel drive (AWD): Function
The fuel tank on vehicles with All Wheel Drive (AWD) employs a multi-chamber (2 chambers) system.
In order to transport the fuel volume from the left chamber to the accumulator-6- of the fuel delivery module in the right chamber, the system uses a so called suction jet pump -8-.
A second suction jet pump -2- is located in the right fuel tank chamber and increases the fuel delivery to the accumulator of the fuel delivery module.
The suction jet pumps operates after the "Fluid entertainment principle": The jet of fuel from the fuel return line -4-is forced via jets in the suction jet pumps -2- and -8-, and is therefore accelerated. This acceleration sucks the surrounding fuel to the accumulator of the fuel delivery module. The right suction jet pump -2-pumps the fuel directly into the accumulator, the left suction jet pump -8- over a separate line -7-.
The fuel is via the distributor connector-1-distributed to both suction jet pumps. At the same time the distributor regulates the pressure in the lines to the suction jet pumps at approx.: 1 bar (14.7 psi). Excessive fuel is sent via a direct line -5- to the accumulator.
3 - Fuel supply line
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.