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AAU3509 - Fuel Return Valve

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- €35,80
€35,80
€35,80 - €35,80
€35,80
Genuine Part
Genuine: Original manufacturer part. This product is the original part designed and produced by the vehicle manufacturer.
Fuel Return Valve in the diesel fuel return circuit, fitted within the fuel filter pipe assembly.

The valve controls the flow of surplus fuel returning from the injection system back to the tank, helping maintain correct pressure in the fuel delivery circuit. For diesel engine applications.
Vehicle Model Land Rover Defender up to 2016
Fitment Notes DEFENDER 1987-2006 — Diesel engines only (fuel filter pipes circuit)
Alternative Codes
AAU3509

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Frequently asked questions

What does the AAU3509 fuel return valve do?
The AAU3509 fuel return valve controls surplus fuel returning from the injection system back to the tank, fitted within the fuel filter pipe assembly on diesel engines. It helps maintain correct pressure in the fuel delivery circuit on Defender diesel applications.
Where is the fuel return valve located?
The fuel return valve sits in the diesel fuel return circuit, within the fuel filter pipe assembly between the injection system and the tank. It belongs to the fuel delivery system on Land Rover Defender diesel engines up to 2006.
What are the signs the fuel return valve is failing?
A failing fuel return valve typically causes fuel pressure problems in the return circuit, which can show as poor starting, uneven running or fuel delivery faults. Because it manages return flow to the tank, a stuck valve disturbs metering on Defender diesel engines.
Does this fuel return valve fit petrol Defenders?
No, the AAU3509 fuel return valve is for diesel engine applications only. It fits Land Rover Defender up to 2006 with diesel engines, in the fuel filter pipe circuit. Confirm your vehicle is diesel before ordering, as petrol fuel systems use a different arrangement.