For 2004-2006 Audi A4 Quattro Fuel Filter In-Line Hengst ... (Martha Kelley)
The fuel pressure regulator and fuel filter are part of the locking flange. I thought it was a fuel filter. With an engine running smoothly, performance is maintained and more optimal MPG.
Fuel filter is located under the car by the drivers door.
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Fuel pump relay and fuel pump fuse should be in the fuse box or power distribution box under the hood. Between the rear axle & the rear of the fuel tank. Battery ok, fuel pump fuse ok, plenty of fuel.
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